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David has been away for more than 25 days.I miss him very mu

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David has been away for more than 25 days.I miss him very much.you know ,25days___
A,is B isn' t C are D aren't
一David has been away for more than 25 days.
--I miss him very much.You know,25 days short.
A.is B.isn’t C are D.aren’t
答案B
本题题意为“David已经离开超过25天了”“我们非常想念他,你知道,25天并不短.”时间、金钱作主语,谓语动词be要用单数形式,因此答案为B.