20．There______a number of books in the library and the number of them______increasing．（　�。�
A．has，isB．have，areC．are，isD．is，are

分析 在圖書館里有許多書，并且它們的數(shù)量正在增長．

解答 答案：C．
根據(jù)There______a number of books in the library and the number of them______increasing．可知這里考查了There be句型，表示"某地（或某時）存在有某人（或某物），而并非某地（某人、某物或某時）擁有什么東西"，句中有若干個名詞作主語，動詞be常與后面主語中的第一個名詞在數(shù)上一致．have一般表示某人有某物，故排除．a(chǎn) number of一些，許多；the number of…的數(shù)目．a(chǎn) number of…修飾可數(shù)名詞復數(shù)，在這里a number of  books表示許多書，是一個復數(shù)形式，所以be動詞應該用are，the number of…，表…的數(shù)量，作主語看做單數(shù)，所以be動詞用is．故選C．

點評 本題考查了there be結(jié)構．解答時注意：a number of一些，許多；the number of…的數(shù)目．

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