I had to wait for half an hour before he ______ see me.

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问题 I had to wait for half an hour before he ______ see me.

选项 A、can
B、may
C、might
D、could

答案D

解析 have to(must)...before...can...“必须……才”,是一个句型。此句是过去时,所以用could。might“也许”,口气太弱,与句义不符。
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