—Does your uncle still smoke?
—He       given it up. It’s two years ever since he      .
A．can’t have; smokedB．may have; smoked
C．should have; has smokedD．should have; didn’t smoke
B
本題考查情態(tài)動(dòng)詞和時(shí)態(tài)。may have done 表示“可能已經(jīng)做某事了”；第二空表示“他不吸煙有兩年了”，since表時(shí)間時(shí)，所接從句謂語動(dòng)詞要用過去時(shí)或過去完成時(shí)。此句型中用延續(xù)性動(dòng)詞表示動(dòng)作停止。
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