【題目】Helen ______ her keys in the office so she had to wait until her husband ______ home.

A. has left; comes B. left; had come

C. had left; came D. had left; would come

【答案】C

【解析】試題分析：句意：海倫把鑰匙落在辦公室了，所以她得等自己的丈夫回家

根據(jù)主句和從句兩個(gè)動(dòng)詞的先后順序可以判斷，丟鑰匙在前，回家再后，且都為過(guò)去式，所以前者用過(guò)去完成時(shí)，后者用一般過(guò)去式

考點(diǎn):考察動(dòng)詞時(shí)態(tài)的用法

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