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【题目】The country spends ____ dollars helping the poor every year.

A.two billion ofB.two billions

C.billion ofD.billions of

【答案】D

【解析】

句意:这个国家每年花费数十亿美元帮助贫民。

考查数词的用法。billion意为十亿,数词。billion前有具体数字时,其后不加s,也不与of连用,若billion前没有数目或数量,则用billions of,固定词组,意为“几十亿,数十亿”。故选D

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