I doubt ________ he will show up as he has promised.

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问题 I doubt ________ he will show up as he has promised.

选项 A、that
B、which
C、what
D、whether

答案D

解析 由whether引导的名词性从句作宾语。句意:我怀疑他是否会像他承诺的那样露面。
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本试题收录于: 英语题库普高专升本分类
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