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【题目】There are six ________ people in the world.

A. billions of

B. billion of

C. billion

D. billions

【答案】C

【解析】句意:世界上有六十亿人。hundred, thousand, million前有数词时,表示实指,hundred, thousand, million用成单数形式;表示虚指时,hundred, thousand, million后跟介词of,hundred, thousand, million用复数形式。本空前有six,表示实指,billion用单数形式。故选C。

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