perhaps it will be a long time_from abroad

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perhaps it will be a long time_from abroad
A that teacher comes back
B WHEN TEACHER WILL COME BACK
C before teacher comes back
D when teacher comes back
选什么为什么?

C,在老师回来之前还有很长一段时间,也就是说“老师还要很久才能回来”
再问：其他呢
再答： when 有两种常见用法，第一种是放在句首问时间，第二种是陈述某事件发生的时间，都是具体时间。但when不能用在时间长度的句子上，when只能用于某一个具体的时间。而且，表示"要很长时间才能怎么样"在英语中常见的只有两种，一种是本题C选项，一种是“not ... until"句型，表示”在什么时候之前不能做什么“也就是说”直到什么时候才能干嘛“

perhaps it will be a long time_from abroad perhaps it will be a long time______from abroad It will be a long time before Frank comes back from abroad . HOW LONG WILL IT BE? It will be a long time___Peter___his work.A.before finishes A(It will) be a B(long) time C(before) we D(will meet)again It's a long time ____I last saw you.Yes,and it will be anoth It will not be long before 和It will be not long before 有什么区别 It will not be long before 和It will be long before it will be a long time__peter__his work.A since,has finished It will be a long time ______ he ______ back from Sidney.A.w How long do you think it will be __ China sends a manned spa