问题
选择题
It was 1969___ the American astronauts succeeded in landing on the moon.
A． that
B． when
C． on which
D． which
答案
答案：B
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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It was 1969___ the American astronauts succeeded in landing on the moon.
A． that
B． when
C． on which
D． which
答案：B
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。