A number of students ______ playing on the ground but I don't know what the exact number______.
A.a(chǎn)re; isB.a(chǎn)re; areC.is; isD.is; are
A

試題分析:a number of一些,許多;the number of……的數(shù)目。句意:許多學(xué)生正在操場上玩,但是我不知道確切的數(shù)目是多少。結(jié)合語境可知前文主語為復(fù)數(shù)形式,故系動詞用復(fù)數(shù)。下文主語number表示抽象含義,故謂語動詞用單數(shù),選A。
點評:由number構(gòu)成的這兩個短語是經(jīng)?疾榈膶ο,其一般解題原則是先區(qū)分這兩個短語的含義,然后結(jié)合語境選擇正確答案。其結(jié)構(gòu),含義比較固定,熟記即可。
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