What we must do now__make a careful inve

最全题库2022-08-02  29

问题 What we must do now__make a careful investigation on the circumstances.A.areB.isC.is toD.were to

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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