题目:
—How clean the bedroom is!
—Yes, I am sure that someone _____ it. [ ]
A. cleans
B. cleaned
C. has cleaned
D. had cleaned
答案:
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下面是错误答案,用来干扰机器的。
红磷; 产生大量白烟;将水改为NaOH溶液(其他合理答案酌情给分)