2. 外语
  3. I have doubts_____everyone present has about_____he is telling the truth.

I have doubts_____everyone present has about_____he is telling the truth.

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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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