I'll go to the library as soon as I finish what I        .
#101936
A
was doing
B
am doing
C
have done
D
had been doing
推荐题目
Those postcards were so lovely that they_________ in no time.
#99830
A
sold
B
had been sold
C
were sold
D
have been sold
No sound and no voice______ for a while. 
#104900
A
have heard
B
has heard
C
has been heard
D
have been heard