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29.The telephone ________ four times in the last hour,and ea

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29.The telephone ________ four times in the last hour,and each time it ________ for my roommate.
29.The telephone ________ four times in the last hour,and each time it ________ for my roommate.
A.has rung; was B.has been ringing; is
C.had rung; was D.rang; has been
可我认为应该选C。因为last hour过去了,应该用过去完成时呀!
had rung是过去的过去,这里应该是过去,但不是过去的过去,所以应该用has rung