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Listen, a small number of students ______ in the classroom.
A.talk B.talks C.is talking D.are talking
D

试题分析:根据a small number of students“少量学生”作主语可知,其后的谓语动词应该用复数形式,故应该排除BC;又根据listen可知,本句的时态应该是现在进行时。所以本题选D。
点评:本题有两个关键点:一是时态,要注意动作发生的时间,尽量找出句中表示时间的词或短语;二是注意区分a number of和the number of的区别:a number of是“许多的”,作主语时谓语动词要用复数;而the number of是“……的数量”,作主语时,谓语动词要用单数。
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