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There are ______ stars in the Galaxy. We can’t count them.

A.billion of B.billions
C.billions of D.billion

C

解析试题分析:句意:在银河系中有数十亿个星星。我们不能数清他们。hundred,thousand million,billion 等和具体数字连用,不加s,是具体数字。hundred,thousand million,billion后加s,of,表示数百,数千,数百万,是模糊数字。根据句意,故选C。
考点:考查数词的用法。

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