来源：互联网 2016-12-19 22:03
(11)We couldn’t catch up with the others because they _____too long before us.
A.started B.were starting C.have started D.had started
(12)She felt anxious about her son as she ________for quite a long time.
A.haven't heard him B. hadn’t heard him
C.haven‘t heard from him D. hadn’t heard from him
(13)By the time the speaker entered the hall, all the listeners_______.
A. had seated B. were seated C. seated D. were seating
(14)By the end of next July this building__________.
A. will be finished B. will have finished
C. will have been finished D. had been finished
(15)By the time the war ____, most of the people had left.
A.was began B. was broken out
C.broke out D. had been broken out
(16)If she ______harder, she would have succeeded.
A. had worked B. have worked C. should work D. worked
(17)I wish ______I you yesterday.
A. seen B. did see C. had seen D. were to see
(18)He is talking so much about America as if he _______ there.
A. had been B.has been C. was D. been
(19)That dinner was the most expensive meal we___.
A. would have B. have had C. had never had D. had ever had
(20)When Jack arrived he learned Mary ______for almost an hour.
A. had gone B. had set of C. had left D. had been away
(11)—(15)D D B C C (16)—(20)A C A D D