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 |
C
解析试题分析：句意：当我不能确定正确答案时，我很沮丧。used to be过去常常。结合句意，故选C
考点：考查动词的用法。
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