________ tigers in the world has reduced...

________ tigers in the world has reduced(减少) in the last fifty years．

A．A number

B．The number

C．A number of

D．The number of

D 【解析】a number of意为“若干”或“许多”，相当于some或a lot of，和复数名词连用，谓语动词用复数形式。必要时，还可以加上形容词great，large，small，good等。the number of...意为“……的数量”，谓语动词用单数形式。

考点分析：

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