10、The telephone____four times in the last twenty minutes，and each time it___for my roommate.

A．rang；has been           B．has been ringing；is

C．had rung；was            D．has rung；was

10、D

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The telephone____four times in the last twenty minutes，and each time it___for my roommate.

A．rang；has been           B．has been ringing；is

C．had rung；was            D．has rung；was

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