问题

It was 1969___ the American astronauts succeeded in landing on the moon.
A: that
B: when
C: on which
D: which
B: when
C: on which
D: which
正确答案是:
同类题型
.I don’t believe everything goes well with you,____?
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n she heard that she failed in theexam, she ______ her face with her hands
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Micro-letters (Weixin) will be charged has not been decided yet.