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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