--The classroom is __________ clean __________ it was yesterday. --Sorry, I forgot to clean it....

--The classroom is __________ clean __________ it was yesterday. --Sorry, I forgot to clean it. A.as; as B.so; as C.not so; as D.more; than

C


试题分析:句意:教室不如昨天干净,对不起,我忘记打扫了。not so(as)…as…,不如,是同级比较的否定,故选C。
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