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The number of students __________fifty.
A.  is        B.are        C.be
A

試題分析：句意：學(xué)生的人數(shù)是50. is 是，單數(shù)形式；are 是，復(fù)數(shù)形式；be 是，動(dòng)詞原形。The number of+復(fù)數(shù)名詞，表示……的數(shù)量，謂語(yǔ)用單數(shù)形式。故選A。
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