People in Korea and Japan are supposed to bow when they meet the first time.A. onB. inC.

问题补充：

People in Korea and Japan are supposed to bow when they meet the first time.

A. on

B. in

C. during

D. for

答案：

A. on

B. in

C. during

(答案→)D. for

解析：句意：在韩国和日本，人们初次见面时应该鞠躬。On在……上；in在……里；during在……期间；for为。表示第几次习惯用介词for，所以选D。

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