15. Are you pleased with the performance?----- Not at all. It couldn’t have beenA. worseB.

问题补充：

15. Are you pleased with the performance?

----- Not at all. It couldn’t have been

A. worse

B. so better

C. better

D. the worst

答案：

(答案→)A. worse

B. so better

C. better

D. the worst

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