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Did you know the Earth is home to __________ animals?
A.millionB.millionsC.millions ofD.million of
C
考查数词。句意为:你知道吗地球是几百万动物的家园?million与数字连用时,表示确定的数目,要用单数形式;与of连用,表示不确定的数目,要用复数形式。所以要选C。
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