1.A large number of books __for the library and the number of the books needed__500.A.is needed ;is B.are needed;are C.are needed;is D.is needed;are2.I don not think ___necessary to read so many useless books.A.that B.this C.one D.it3.The police have

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1.A large number of books __for the library and the number of the books needed__500.A.is needed ;is B.are needed;are C.are needed;is D.is needed;are2.I don not think ___necessary to read so many useless books.A.that B.this C.one D.it3.The police have
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1.A large number of books __for the library and the number of the books needed__500.A.is needed ;is B.are needed;are C.are needed;is D.is needed;are2.I don not think ___necessary to read so many useless books.A.that B.this C.one D.it3.The police have
1.A large number of books __for the library and the number of the books needed__500.A.is needed ;is B.are needed;are C.are needed;is D.is needed;are2.I don not think ___necessary to read so many useless books.A.that B.this C.one D.it3.The police have searched for 6 days___the robbers.A.to B.for C.with D.during

1.A large number of books __for the library and the number of the books needed__500.A.is needed ;is B.are needed;are C.are needed;is D.is needed;are2.I don not think ___necessary to read so many useless books.A.that B.this C.one D.it3.The police have
1.C;因为a number of是指很多,而the number of是指数量
2.D；这种题做得多了,自然就会选it,我很久没学英语了,但这个题我以前做了很多次
3.B；因为短语有have searched for sth/sb这里与searched搭配的是后面的for

1. C
2. C
3. B

1.选择C。实验表明：如果定期进行适量的练习，可以使我们更健康是一个省略句，原为if it is carried out regularly……可以将it is（主语，系动词）删除

1 C
2.D
3.B

1 c 2d 3 b

1、C 2、C 3、B

CDB

1. C 2. D 3. B

1.C 2.D 3.B

C，前半部分是以书为主语，是复数，后部分是the number 为主语
D, it 为形式主语
A， to 是搜寻的意思，for是搜查

答案：1C,2D,3B
1.a number of 是大量的，后+可数名词复数，the number of ......的数量用单数
2.it做形式宾语代替不定式
3.search for 寻找，搜寻。第一个for 是加时间段的

1.C，books是主语且复数形式，后面一空的主语是the number，所以用单数形式
2.觉得是it's 选项可能是打错了吧
3.B，选代表目的的介词

C。区分a number of后面谓语动词为复数，the number of后面谓语动词为单数。
D。
B。search...for...固定搭配

a large number of 同义词 a large number of ;large number of等的用法 the number of、a number of、large number的区别 a large number of+可数/不可数? A large number of的反义词 there is a large number of children还是there are a large number of children正确 There is a large number of还是there are a large number of a great deal of和a large number of区别 a number of和large numbers of的区别 a number of和large numbers of的区别 a large number of 和 huge amounts of 的用法 a large number of与huge amounts of的区别 masses of 与a large number of区别 a large number a lot a large amount of a large number of得区别 the number of,a small number of,a number of.,a great number of,a large/small number of,区别和后面该接可数和不可数名词 A large amount of money和a large number of money这样用是不是都对? a large number of和a large amount of的区别