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用a number of或the number of填空 1.I have been to Beijing_____ti

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用a number of或the number of填空 1.I have been to Beijing_____times.
2._____the students in our school has risen this year.
3._____visitors came to our school to attend the international educational conference.
1.a number of a number of:许多的,我去过北京许多次.
2.the number of the number of:什么都数目,数量(谓语动词用单数)
3.a number of