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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