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In our school library there ________ a n...

In our school library there ________ a number of books on science,and in these years the number of them ________ growing larger and larger.

A. are;is    B. is;are    C. has;is

 

A 【解析】句意:在我们学校图书馆有许多关于科学的书,这些年它们的数量变得越来越大。本题考查there be句型。首先,此句型中be动词的单复数由离它最近的名词来确定,其次a number of表示“若干的;许多的”,后接复数可数名词作主语时,其be动词用are;而the number of…表示“…的数量”,后跟复数名词,而number作主语的中心词时,be动词用is。故答案选A。 点睛:the number of表示“……的数量”,跟复数名词连用作主语时,中心词是number,谓语动词要用三单形式。例如: The number of the students in our class is 50. 我们班学生的数量是50人。 a number of表示“许多”,相当于 many,修饰可数名词复数,主语视作复数。number前可用large, small等修饰,以表示程度。例如: A number of students are planting trees on the hill. 许多学生在小山上植树。  
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