A number of students _______ reading in the classroom now.
A．isB．wasC．a(chǎn)reD．were
C
C 考查a number of和the number of的區(qū)別，前者意為“許多”，與many等同；后者意為“......的數(shù)量”，謂語用單數(shù)�！艾F(xiàn)在有很多學生在教室里讀書�！惫蔬xC。
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