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【题目】 I often doubt _________David is willing to help those homeless people.

A. whether B. that C. when D. how

【答案】A

【解析】

试题分析:句意:我常常怀疑是否大卫愿意帮助那些无家可归的人。A. whether是否;B. that 宾语从句的连接词;C. when 何时;D. how如何。doubt表示疑问,排除B,结合句意理解,故答案为A。

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