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

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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

A 可能或许 B 被用来 C 过去常常 D习惯做
我过去常常因为不确定的答案而苦恼沮丧.

C

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