4. Perhaps the most significant postwar trend was the decentralization of cities throughout the United States， _________ when massive highway-building programs permitted greater suburban growth.
A. and accelerated a phenomenon
B. a phenomenon that accelerated
C. accelerating a phenomenon which，
D. the acceleration of which phenomenon
答案：B
分析：考的是同位語結(jié)構(gòu)，a phenomenon是 the decentralization of cities throughout the United States 的同位語。A中and為conj.，后面應該連接一個完整的句子，但缺主語，錯;C中語序混亂，錯; D中of which作為介詞賓語，后面應該接一個完整句，但只有一個phenomenon主語，句子不完整，錯。
參考譯文：可能戰(zhàn)后最重大的趨勢就是美國城市的分散化，當大規(guī)模高速公路建設項目容許了更大程度的發(fā)展郊區(qū)，這個現(xiàn)象更被促進了。
補充： accelerate/ accomplish/ achieve/ evolve都可以是vi.不接賓語
5. Ronald Reagan had served two terms as governor of California before _________ President.
A. he became
B. when becoming
C. became
D. did he become
答案：A
分析：before為狀語從句引導詞conj，后面一般引導一個完整的句子。B同時出現(xiàn)兩個狀語從句引導詞，錯;C缺主語;D應該為正常語序，選項中使用了倒裝句式，錯。
參考譯文：里根在成為美國總統(tǒng)之前連續(xù)兩屆擔任加州的州長。
6. _________， domesticated grapes grow in clusters， range in color from pale green to black， and contain sugar in varying quantities.
A. Their botanical classification as berries
B. Although their botanical classification as berries
C. Because berries being their botanical classification
D. Classified botanically as berries
答案：D
分析：句子的主語是grapes ， 后面是平行結(jié)構(gòu)grow…， range…， and contain…?？崭窈蟮木渥右淹暾?，那么空格處就應該是同位語，狀語從句，分詞等修飾成分。A中Their指代不明，而且classification和berries也不相符，錯;B中Although為conj.，后面應該是完整句，錯;C中Because為conj.，后面應該是完整句，錯。
參考譯文：培植的葡萄的植物分類跟漿果是一樣的，它們成串的長在樹上，顏色從灰白色到黑色，并且包含由不同數(shù)量的糖份。
A. and accelerated a phenomenon
B. a phenomenon that accelerated
C. accelerating a phenomenon which，
D. the acceleration of which phenomenon
答案：B
分析：考的是同位語結(jié)構(gòu)，a phenomenon是 the decentralization of cities throughout the United States 的同位語。A中and為conj.，后面應該連接一個完整的句子，但缺主語，錯;C中語序混亂，錯; D中of which作為介詞賓語，后面應該接一個完整句，但只有一個phenomenon主語，句子不完整，錯。
參考譯文：可能戰(zhàn)后最重大的趨勢就是美國城市的分散化，當大規(guī)模高速公路建設項目容許了更大程度的發(fā)展郊區(qū)，這個現(xiàn)象更被促進了。
補充： accelerate/ accomplish/ achieve/ evolve都可以是vi.不接賓語
5. Ronald Reagan had served two terms as governor of California before _________ President.
A. he became
B. when becoming
C. became
D. did he become
答案：A
分析：before為狀語從句引導詞conj，后面一般引導一個完整的句子。B同時出現(xiàn)兩個狀語從句引導詞，錯;C缺主語;D應該為正常語序，選項中使用了倒裝句式，錯。
參考譯文：里根在成為美國總統(tǒng)之前連續(xù)兩屆擔任加州的州長。
6. _________， domesticated grapes grow in clusters， range in color from pale green to black， and contain sugar in varying quantities.
A. Their botanical classification as berries
B. Although their botanical classification as berries
C. Because berries being their botanical classification
D. Classified botanically as berries
答案：D
分析：句子的主語是grapes ， 后面是平行結(jié)構(gòu)grow…， range…， and contain…?？崭窈蟮木渥右淹暾?，那么空格處就應該是同位語，狀語從句，分詞等修飾成分。A中Their指代不明，而且classification和berries也不相符，錯;B中Although為conj.，后面應該是完整句，錯;C中Because為conj.，后面應該是完整句，錯。
參考譯文：培植的葡萄的植物分類跟漿果是一樣的，它們成串的長在樹上，顏色從灰白色到黑色，并且包含由不同數(shù)量的糖份。