20．(黑龙江省哈三中09-10学年高三11月月考) --- Have you ever heard about the collapse of a high-rise building in Shanghai on June 27, 2009? --- Yes. I feel strongly that the work so carelessly. A. shouldn’t have been done B. needn’t be done C. mustn’t have been done D. can’t be done 答案 A 【
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