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

—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→)A. could have doneB. must have doneC. could doD. 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。

这个答案应该是对的

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