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【题目】The ruler white .

A. am B. is C. are D. be

【答案】B

【解析】

试题分析:句意:这把尺子是白色的。am是,主语是I。is是,主语是第三人称单数; are主语是you或复数; be是,动词原形。因为主语the ruler是第三人称单数,故谓语用单数is。故选B

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