2017年理工類職稱英語考試詞匯訓(xùn)練題

詞匯選項(xiàng)
    To understand what we are going to talk about today， you have to rely on what you have read previously.
    A.beforehand
    B.carefully
    C.before
    D.in advance
    【正確答案】 C
    【答案解析】 previously 是副詞，“以前、先前”，和作副詞用的before同義；beforehand 和 in advance意思相同，都是“事先，預(yù)先”的意思。