题目内容

It isn't quite _____ that he will be present at the meeting.
A．sureB．rightC．exactD．certain
D. certain.
  I am sure that +从句。He is sure to come. =" He" is certain to come.但在it作形式主语, that引导主语从句时, 主句中表语只能用certain, 不能用sure.
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