Mr. Thompson was very uncertain ______whether it was the right decision in teami

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问题 Mr. Thompson was very uncertain ______whether it was the right decision in teaming up with his coworker, Mr. Barns.

选项 A、for
B、if
C、as to
D、even though

答案 C

解析语法：介词1．选项由介词和连词构成。2．空格后已有连词whether引导名词性从句，因此连词(B)选项和(D)选项排除3．as to和介词about意义相同。与句意相符，因此(C)为正确选项。

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