It was 1969 the American astronauts succeeded in landing on the moon. AthatBwhen C.

发布时间：2020-08-16 20:41:04

It was 1969     the American astronauts succeeded in landing on the moon.
Athat
Bwhen
Con which
Dwhich

网友回答

A. that
(答案→)B. when
C. on which
D. which
解析： when 引导定语从句修饰时间1969 。1969前加上介词in可以选A ，此时是强调句。
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