Helen _____ her keys in the office so she had to wait until

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Helen _____ her keys in the office so she had to wait until her husband _____ home.
A.had left; comes B.left; had come C.had left; came D.had left; would come

答案C 完成时表示的动作发生一般时之前．第一空用完成时,第二空用一般时．因为此题是在叙述一件发生过的事,应在过去时中选择两个相应的时态,即过去完成时,一般过去时．查看原帖

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