【題目】Do you know that the Earth is home to     animals?

A.millionB.millions

C.million ofD.millions of

【答案】D

【解析】

句意:你知道地球上有數(shù)以百萬(wàn)計(jì)的動(dòng)物嗎?

million前面有具體的數(shù)字時(shí),million用單數(shù)形式,如果表示不確定的數(shù)目,million要用復(fù)數(shù)形式,后面與of連用,millions of數(shù)百萬(wàn)。故答案為D。

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