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用the number of 或 a number of 填空

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用the number of 或 a number of 填空
1.( )cares on the roads has doubled over the past few years in our country.
2.We have been friends for ( )years.
理由要说
1.the number of
车的数量增加了
2.a number of
我们做朋友已经很久了