It isn't quite he will be present at the meeting.

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It isn't quite ____ ____ he will be present at the meeting.
A.sure,whether B.sure ,if C.certain,whether D,certain ,that
选哪个,sure和certain 有什么区别

人作主语,意为“某人肯定 .”,既可以用sure又可以用certain.但如果主语是it（即it做形式主语）,则此处不能使用sure,只能用certain.
--I'm not quite sure whther he will come.
--It is not certain whether he will come.= Whether he will come is not certain.
总结：sure指的是人主观性的、直觉性的推断.certain就没这个意思.
请翻翻例句多的词典,看看certain的例句就可以明白了.

It isn't quite ___ that he will be present at the meeting. 词汇辨析It isn't quite { }that he will be present at the meeting 翻译It isn't quite certain that he will be present at meeting. .It isn‘t quite that he will he present at the meeting.　　A.c 1.It isn’t quite _____ ______ he will be present at the meet IS QUITE CERTAIN THAT HE WILL BE PRESENT AT THE MEETING 一道英语单选题.It isn't quite ____ whether she will take the advice It is not quite___that he will be the present at the meeting He doesn't konw what ____(say)at the meeting. You can't see Mr Jones.He is ____ at the moment.He will be _ He seemed ____ at what you said at the meeting. I didn't see him at the meeting yesterday afternoon.He ____