––Theboxistooheavytocarry.What'sinit?  ––Oh,it

问题详情：

––The box is too heavy to carry. What's in it?   ––Oh, it_________ books.

A. is filled with   C. is good at    B. is used for    D. be afraid to

【回答】

A

知识点：动词和动词短语

题型：选择题