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【题目】They promise that they will finish the project in a month,but I remain _______about their claim.

A.optimistic

B.concerned

C.mysterious

D.skeptical

【答案】D

【解析】optimistic意为乐观的;concerned意为关心的;mysterious意为神秘的skeptical意为怀疑的。由but一词可知我对他们的话感到怀疑,故选D项。

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