When the positive integer n is divided by 7，the quotient is q a

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When the positive integer n is divided by 7，the quotient is q and the remainder is 4. When 2n is divided by 7，the remainder is 1 and the quotient，in terms of q，is

A、 q/2
B、 q/2+1
C、2q
D、2q+1
E、2q+2

答案：D

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