问题详情：
—The box is too heavy to carry. What’s in it?
—Oh, it is books.
A. filled with B. covered with
C. used for D. asked for
【回答】
A。考查动词短语辨析。be filled with“被……填满”, be covered with“被……覆盖”, be used for“被用来……”, be asked for“被索要……”。句意: ——这个箱子太重了, 搬不动。它里面是什么? ——哦, 它装满了书。故选A。
知识点：动词和动词短语
题型：选择题
