I have doubts_____everyone present has about_____he is telling the truth.A、why,

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问题 I have doubts_____everyone present has about_____he is telling the truth.

选项 A、why, if
B、that, whether
C、whether, whom
D、when, which

答案 B

解析 此句中有两个从句,doubt为名词,其后第一个从句everyone present has为关系分句,先行词即doubt,从句所缺信息即先行词内容,故选关系代词that作为连词;第二个从句接在介词之后,为宾语从句;再结合肯定句中doubt后接whether或if,以及介词之后只能使用whether,不能使用if表示“是否”,从而得出答案是whether。
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