You must have studied English for years, ________?
A.must youB.have youC.mustn't youD.haven't you在线课程D
解析：
导解：must表示推测，用于反意疑问句时，疑问部分一般不用must或mustn't．若前句强调对过去情况的推测(一般有过去时间状语)，疑问部分的谓语动词用didn't+主语；
若前句强调动作的完成，疑问部分的谓语动词用hasn't/haven't+主语．
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