摘要：5．(2009年南通市高三调研测试)Ever since Dolly.the sheep was cloned in 1997.Westhusin’s phone with people calling in hopes of making the copies of their pets. A．has rung B．rang C．was ringing D．has been ringing 解析:选D.考查动词的时态.由该句的时间状语“Ever since Dolly....in 1997 判断.应用完成时.但ring是瞬间动词.不能与“ever since+过去时(间)的时间状语 连用.故用现在完成进行时.

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