Thosearethebooks________veryuseful

发布时间:2020-07-26 15:43:15

Those are the books ________ very useful to us.A.who isB.who areC.that isD.that are

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D解析【巧解点悟】先行词是物且是复数,关系代词充当主语时,从句中的谓语动词必须与先行词在数上一致.
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