Question

【题目】He is always careless and knocks his classmates’ books _____their desks when he passes by.

A.downB.overC.offD.on

Answer 1

【答案】C

【解析】

句意：他总是粗心大意，路过时把同学的书从桌子上撞下来。

本题考查动词短语的辨析。A.下降；B.超过；C.关闭,从(某处)落下；D.打开。根据knock off 是撞得掉下来的意思，可知，此空应填off，故选C。