I doubt_____he is the murderer because he is not on the scene at that moment.A、w

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问题 I doubt_____he is the murderer because he is not on the scene at that moment.

选项 A、why
B、that
C、whether
D、when

答案 B

解析在肯定句中，及物动词doubt后面也可以接that引导的宾语从句，但表示疑虑较大或“不相信”。

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