第17题 I ____writing the article by the time you get back.
A、shall finish
B、must have finished
C、have finished
D、shall have finished
第18题
you had some trouble finding ｗhere i live, ______?
A、didn’t you
B、hadn’t you 
C、do I
D、don’I
第19题 It was not until then that I came to know knowledge ____only from practice.
A、had come
B、came
C、would come
D、comes
第20题
"Got your plans for the weekend, Bill?" "Well, I had planned to go to London, but I _____ afford the train fare."
A、can
B、can't
C、may
D、might 
中石油北京《大学英语（二）》2011年春学期在线作业（一）.txt (7.82 KB)