No one doubts ______ he is the best leader in the company.

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问题 No one doubts ______ he is the best leader in the company.

选项 A、whether
B、if
C、what
D、that

答案D

解析 doubt用在否定句中其后的宾语从句要用that引导;用在肯定句中其后的宾语从句要用if或whether引导。
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