【題目】The ruler white .

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

【答案】B

【解析】

試題分析：句意：這把尺子是白色的。am是，主語是I。is是，主語是第三人稱單數(shù)； are主語是you或復(fù)數(shù)； be是，動詞原形。因?yàn)橹髡Zthe ruler是第三人稱單數(shù)，故謂語用單數(shù)is。故選B。

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