I'm sorry to have you waiting so long for Marcia,and I am af

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I'm sorry to have you waiting so long for Marcia,and I am afraid it'll be ten minutes ____ she comes back.
A,before B.after C.until D.when

I'm sorry to have you waiting so long for Marcia,and I am afraid it'll be ten minutes ____ she comes back.
A,before B.after C.until D.when
答：A.
译：对不起让你久等Marcia了,恐怕要过10分钟她才会回来.
析：有四个句型,很有用又很容易混淆：
before 之过去句型：It was some time before sth.happened.过了多久才发生某事.
before 之将来句型：it will be some time before sth.happens.要过多久才会发生某事.
since 句型：it is (=has been) some time since sth.happened.自某事发生以来,已经多少时间了.
when句型：it was 时间点（如1997） when sth.happned.某事发生时,时间是1997年.
that 强调句型：It was 时间状语（如in 1997) that sth.happened.为sth.happned in 1997.之强调时间状语.
本题为before的将来用法.

I‘m sorry to have you waiting so long for Marcia ,and I’m af I'm sorry to have you waiting so long for Marcia ,and I’m af 初中英语I'm sorry to have you waiting for so long for Marcia,and I'm sorry to have kept you waiting so long. I'm sorry to have kept you waiting so long 和i' m sorry to ke I am sorry you have been waiting so long .BUT I am very sorry for keeping you waiting so long. i am sorry to keep you waiting so long I'm sorry.I have kept you ()for me so long.A:wait B:waiting i am sorry to keep you waiting for me so long 最佳答句是什么? I'm sorry to keep you waiting so long I am sorry to have kept you waiting for a long time.