【題目】________ tigers in the world has reduced(減少) in the last fifty years．

A．A number

B．The number

C．A number of

D．The number of

【答案】D

【解析】a number of意為“若干”或“許多”，相當(dāng)于some或a lot of，和復(fù)數(shù)名詞連用，謂語動詞用復(fù)數(shù)形式。必要時，還可以加上形容詞great，large，small，good等。the number of...意為“……的數(shù)量”，謂語動詞用單數(shù)形式。

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