The number of teachers in our college _____ greatly increased this term. A number of teachers in this school _____ from the countryside.
A．is; isB．is; areC．a(chǎn)re; areD．a(chǎn)re; is
B
the number of“的數(shù)量”，作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞常用單數(shù)，而“a number of+復(fù)數(shù)名詞”意思是“大量的；許多”，作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式。
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