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while since before the minute
didn’t see haven’t seen hadn’t seen don’t see
million of year million year millions years millions of years
millions million million of millions of
Millions…on Million…in Millions…on the Million…on
are allowed is allowed will be allowed allow
Millions... on Million... in Millions... on the Million... on
B.C.D.四个选项中，选出可以填入空白处的最佳选项As we know, ________ have lived on Earth for ________ years.A. human; millions human; millions of humans; millions humans; millions of
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million of millions of two millions two million
25 years 50 years hundreds of years a few years
25 years 50 years hundreds of years a few years
didn’t see haven’t seen hadn’t seen don’t see
long before before long long ago away from
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couldn’t have enjoyed; since needn’t have enjoyed; since wouldn’t have enjoyed; before shouldn’t have enjoyed; before
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