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

游客2023-10-26  61

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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