【題目】 A number of students_______ playing on the playground, but I don’t know what the exact number_______.

A. is; is B. are; are

C. is; are D. are; is

【答案】D

【解析】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D。

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