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

試題分析：句意：學生的人數是50. is 是，單數形式；are 是，復數形式；be 是，動詞原形。The number of+復數名詞，表示……的數量，謂語用單數形式。故選A。
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