Did you know the Earth is home to __________ animals?
A．millionB．millionsC．millions ofD．million of
C
考查數(shù)詞。句意為：你知道嗎地球是幾百萬(wàn)動(dòng)物的家園？million與數(shù)字連用時(shí)，表示確定的數(shù)目，要用單數(shù)形式；與of連用，表示不確定的數(shù)目，要用復(fù)數(shù)形式。所以要選C。
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