— Why on earth didn’t you answer the door? — I’m terribly sorry, but the telephone _______, too.
#99983
A
is ringing
B
was ringing
C
rang
D
was about to ring
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After school we went to the reading-room to do some reading ,only to be told that it _______.
#99938
A
was decorated
B
had decorated
C
had been decorating
D
was being decorated
I am so tired,for I ________ English for 2 hours.
#99761
A
is studying 
B
have been studying
C
was studying 
D
had been studying