题目内容
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
A
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题目内容
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