【題目】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】

試題句意：當(dāng)我不能確定正確答案時(shí)，我很沮喪。used to be過(guò)去常常。結(jié)合句意，故選C

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