I frustrated when I wasn't sure of the correct answer. [ ] A．may beB．used to C．use to beD．used 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．use to be

D．used to be

答案：D
解析：

点拨：本题考查used to do sth. 过去常常做某事。此题往往不考虑frustrated的词性是形容词，而误选为B。

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