What we must do now__make a careful investigation on the circumstances.A.areB.isC.is toD.were to
What we must do now__make a careful investigation on the circumstances.
A.are
B.is
C.is to
D.were to
B.is
C.is to
D.were to
参考解析
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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