—How did you like the concert last night ?—I enjoyed it very much but the dancers a bett

问题补充：

—How did you like the concert last night ?

—I enjoyed it very much, but the dancers a better job．

A. could have done

B. must have done

C. could do

D. had done

答案：

(答案→)A. could have done

B. must have done

C. could do

D. had done

解析：考查情态动词用法，根据句意可知此处为情态动词的虚拟用法，表示对过去的虚拟，所以排除CD。A意为本可以干某事 B，意为一定做了某事

句意为你感觉最晚的音乐会怎么样？----我很喜欢，但是如果舞蹈演员本可以调地更好些。