What we are going to do is _____ the matter immediately.A.look into B.to look into C.looking into D.looked into为什么是A?

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What we are going to do is _____ the matter immediately.A.look into B.to look into C.looking into D.looked into为什么是A?

What we are going to do is _____ the matter immediately.A.look into B.to look into C.looking into D.looked into为什么是A?
What we are going to do is _____ the matter immediately.
A.look into B.to look into C.looking into D.looked into
为什么是A?

What we are going to do is _____ the matter immediately.A.look into B.to look into C.looking into D.looked into为什么是A?
A.look into
is前面有do是时后面的动词用原形

这里选look into是因为 What we are going to do is (that)look into the matter immediately. 这里 is 后面是一个省略that的表语从句,that以后必须是一个完整的句子。look用原型这里相当于祈使句做表语从句。

主语中有do的形式,表语要省略to