It was the third time that I _______of the changes of the timetable.
#102644
A
had informed
B
has informed
C
had been informed
D
has been informed
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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
I ___________ to phone her all day, but whenver I phone her, the line is engaged.
#101328
A
tried
B
had been trying
C
have tried
D
have been trying