Max’s legs are too long. When he walks our desk he often knocks our books the floor.A.

问题补充：

Max’s legs are too long. When he walks our desk, he often knocks our books the floor.

A. in, on

B. on, into

C. past, onto

D. along, on

答案：

A. in, on

B. on, into

(答案→)C. past, onto

D. along, on

解析：句意：麦克斯的腿太长。当他经过我们的课桌时，他经常把我们的书撞到地上。in在……里，on在……上，past经过，along沿着，onto在……上；根据语境可知选C.