—Does your uncle still smoke?—He given it up. It’s two years ever since he .A.can’t have; smokedB.may have; smokedC.should have; has smokedD.should have; didn’t smoke
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B解析本题考查情态动词和时态。may have done 表示“可能已经做某事了”;第二空表示“他不吸烟有两年了”,since表时间时,所接从句谓语动词要用过去时或过去完成时。此句型中用延续性动词表示动作停止。