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(dòng)詞用復(fù)數(shù)。下文主語number表示抽象含義，故謂語動(dòng)詞用單數(shù)，選A。
點(diǎn)評(píng)：由number構(gòu)成的這兩個(gè)短語是經(jīng)�？疾榈膶�(duì)象，其一般解題原則是先區(qū)分這兩個(gè)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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