【題目】

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

【答案】C

【解析】drop in拜訪;drop off打盹兒,小睡;drop out輟學(xué),中止;drop by順便拜。

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