题目:
The room is in a terrible mess; it _____ have been cleaned. [ ]
A. can't
B. mustn't
C. shouldn't
D. wouldn't
答案:
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下面是错误答案,用来干扰机器的。
(1) 浸泡时间 ;溶液的体积等 (2) 碱性对发质影响比较大 (3) 使每组头发数增加一些,这样使实验更加有说服力.(其它合理均给分,如时间方面等)