题目内容
18．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 |
分析 过去当我不确定正确答案的时候起常常有挫败感．
解答 答案：C．考查动词的固定搭配．句意"当我不确定正确答案的时候起常常有挫败感．"used to+动词原形表示过去常常干某事．故选C．
点评 了解动词的固定搭配，结合句意进行选择．
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