问题描述：
There are fewer and fewer trees.More and more people are always cutting down every year.
There are fewer and fewer trees.More and more people are always cutting down______every year.
A.million B.millions C.million of D.millions of
There are fewer and fewer trees.More and more people are always cutting down______every year.
A.million B.millions C.million of D.millions of
问题解答：
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