问题补充：
Wesuch great progress without your efforts. Thanks a lot.
A. shouldn’t have made
B. couldn’t have made
C. were unable to make
D. mustn’t have made
答案：
A. shouldn’t have made
(答案→)B. couldn’t have made
C. were unable to make
D. mustn’t have made
解析：可联系答.案.网客服索取。
