I doubt_____they can swim across the river.A、whyB、thatC、whetherD、whenC在肯定句中，

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问题 I doubt_____they can swim across the river.

选项 A、why
B、that
C、whether
D、when

答案 C

解析在肯定句中，及物动词doubt后的宾语从句，多用whether或if引导，表示“怀疑是否，怀疑能否”。

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