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问题: 选什么? 为什么?

We had an anxious couple of weeks _____ for the results of the experiment.
A. wait B. to be waiting
C. waited D. waiting

解答:

D
waiting for the results of the experiment表示We had an anxious couple of weeks的伴随状态。
we和wait是主动关系,排除C,选非谓语,排除A,不表目的,排除B