2017年綜合類職稱英語(yǔ)考試單選練習(xí)題

字號(hào):


    
詞匯選項(xiàng)

    If a fever continues to exist,a doctor should be called since this may mean that a more serious infection is present.
    A.disappears
    B.persists
    C.perishes
    D.vanishes