一道语法题Helen _____ her key in the office so she had to wait un

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一道语法题
Helen _____ her key in the office so she had to wait until her husband _____ home.
A.has left; comes \x05\x05B.left; had come
C.had left; came \x05\x05D.had left; would come
此题答案为C 请问为什么第二空要选came

选C,第一个空用过去完成是因为他的参照时间是wait,是过去的动作,所以符合“过去的过去”这一要求；第二个空的come用过去时是因为这个动作已经发生.

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