问题

It was in 1969 ___ the Americanastronauts first succeeded in landing on the moon.
A:that
B:when
C:which
D:in which
B:when
C:which
D:in which
正确答案是:
同类题型
think what ______ me about his paintings is the colors he uses.
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Would you like me to help you with the homework—____________ . But I can manage it myself.
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