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 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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