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Did you know the Earth is home to __________ animals?
A．millionB．millionsC．millions ofD．million of
C
考查數詞。句意為：你知道嗎地球是幾百萬動物的家園？million與數字連用時，表示確定的數目，要用單數形式；與of連用，表示不確定的數目，要用復數形式。所以要選C。
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