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19、The telephone ______________three times in the last hour,and each time it ________       for my father.

A. has rung; was                       B. had rang; would be

C. rang; has been                      D. was ringing; is

19、A

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The telephone ______________three times in the last hour,and each time it ________       for my father.

A. has rung; was                       B. had rang; would be

C. rang; has been                      D. was ringing; is

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