What we must do now______make a careful investigation on the circumstances.

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问题 What we must do now______make a careful investigation on the circumstances.

选项 A、are
B、is
C、is to
D、were to

答案C

解析 考查主语从句。本句的主语是What we must do now,这是一个表示单数的主语从句,而空格后是一个动词短语,因此选择C项,即动词不定式作表语。
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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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