Tim is dubious about diet pills which advertise quick weight loss.

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问题 Tim is dubious about diet pills which advertise quick weight loss.

选项 A、anxious
B、pessimistic
C、doubtful
D、ignorant

答案C

解析本题中，dubious的意思是“可疑的，不确定的”。C项doubtful“怀疑的”符合题意，如：be [feel]doubtful of [about] the data(怀疑那些数据)。其他三项anxious“担忧的”，pessimistic“悲观的”，ignorant“无知的”都不正确。

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