改写同义句 I‘ll never go to bed until I work out the problem.I'll go to bed _______ I work out the problem.每空一词,急求!~~~~~~~谢谢
问题描述：
改写同义句 I‘ll never go to bed until I work out the problem.
I'll go to bed _______ I work out the problem.
每空一词,急求!~~~~~~~谢谢
答
after
答
when
while
答
after,在.之后
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