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【题目】Could you tell me how long ______ the navy?
A.you have joined
B.have you joined
C.you have been in
D.have you been in

【答案】C
【解析】考查时态。句意:你能告诉我你在海军服役多长时间了吗?现在完成时态和一段时间连用,谓语动词用持续性动词,join是短暂动词,与段时间连用时应改写成be in,因此可以排除A项和B项,宾语从句应为陈述语序,所以答案是C。

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