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?
问题描述：
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?
答
主语中有do的形式，表语要省略to
答
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。
答
A.look into
is前面有do是时后面的动词用原形