It's the frist time that I( )asleep then.A.must be B.must have been C.should be D.should have been

It's the frist time that I( )asleep then.A.must be B.must have been C.should be D.should have been
为什么
英语人气:691 ℃时间:2019-10-11 20:29:08
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B主+序数词+time that +that_分句,that 后一律用完成时当主句动词为is/will be 时,that 分句动词一律用现在完成时,引导词that 可以省略,如:it's the first time i've been here当主句动词为was 时,that 分句动词...
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