请帮忙解答下这道英语题,并说明理由。
()17.Couldyoutellmehowlong__________thefootballclub?A.youhavejoinedB.haveyoujoinedC.y...
( )17. Could you tell me how long __________ the football club?
A. you have joined B. have you joined
C. you have been in D. have you been in 展开
A. you have joined B. have you joined
C. you have been in D. have you been in 展开
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