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

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

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

答案C

解析 dubious可疑的，不确定的；anxious担忧的；pessimistic悲观的；doubtful怀疑的；ignorant无知的。

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