How long ______ you ______ to music? People need rest. Don’t you understand?
A. have; listened
B. did; listen
C. had; been listening
D. have; been listening
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The telephone ________ for three minutes before it was answered.
A. had been rung
B. rang
C. had been ringing
D. has rung
Mother is ill and she ________ in bed for three days.
A. has been laying
B. has been laid
C. laid
D. has been lying
Since her arrest last Sunday, she ________ on hunger strike with her fellow prisoners.
A. was
B. has been
C. is
D. had been
They ________ for 20 minutes before the bus came.
A. were waiting
B. had been waiting
C. have been waiting
D. waited
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