I frustrated when I wasn’t sure of the correct answer. A. may be B. used to C. used to be D. use to be 题目和参考答案——青夏教育精英家教网——

题目内容

I ___________ frustrated when I wasn’t sure of the correct answer.

A. may be B. used to C. used to be D. use to be

【答案】

C

【解析】本题考查used to的用法。used to+动词原形表示过去常常干某事，故选C。

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I ___________ frustrated when I wasn’t sure of the correct answer.

A. may be B. used to C. used to be D. use to be