Question

【题目】Bill is very fat. When he walks past my desk, he often________ my books ________ the floor.
A.knocks; for
B.knocks; off
C.knocks; over
D.knocks; onto

Answer 1

【答案】D
【解析】knock sth off 意为“把某物从……撞下来”，knock sth onto the floor 意为“把某物撞到地上”，根据句意“比尔很胖，当他从我桌子旁经过时，经常把我的书撞到地上。”可知选 D。