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---- One more question, Sir?
----Wait a minute. I ____ your questions for more than 30 minutes without a break.
Where is my cup?
A.have been answeringB.have answered
C.had answeredD.answered
A
考查时态。句意:还有一个问题,老师?——等一下。我毫不休息的一直回答你的问题超过三十分钟了。可知下文描述的是到现在已经完成的正在进行的动作,故用完成进行时态。选A
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