349.We don't have enough boxes _____.

问题描述:

349.We don't have enough boxes _____.
A.to put these books B.to put these books in C.putting these books D.putting these books in

B.to put these books in
“用来放书”,这是表目的
表目的的话,要用不定式做后置定语,排除CD
因为是put these books in ( the boxes ) ,所以in不能省略,选B