A
用法和hundred thousand million 一样的 前面有数词 不加复数
但是当它们后面接of 就要用复数 入 millions of 数以百万计的
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the population of the world is over seven ____now.
the population of the world is over seven ____now.
A.billion B.billions Cbillions of D.billion of
A.billion B.billions Cbillions of D.billion of
英语人气：279 ℃时间：2020-04-15 04:41:26
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