题目

The number of the students in our school _____ about 3, 000 and a number of them _____ from the countryside. A. is; is                   B. is; are                  C. are; is 答案：B。考查主谓一致。前一分句的主语是the number, 所以谓语动词用is；后一分句的主语是a number of them(他们中有很多), 所以谓语动词用are, 故选B。

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