Question

【题目】

When the cooking class changed to Thursday, I had to so that I could pick up my son from his piano lesson.

A. drop in

B. drop off

C. drop out

D. drop by

Answer 1

【答案】C

【解析】drop in拜访；drop off打盹儿，小睡；drop out辍学，中止；drop by顺便拜。