Alice,are you ready?We'll go out for a picnic __ nine o'clock.A.in B.after C.until D before为什么不选择D

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Alice,are you ready?We'll go out for a picnic __ nine o'clock.A.in B.after C.until D before
为什么不选择D

没有上下文的吗?

将来时不是用in?