— The classroom is clean it was yesterday.— Sorry I forgot to clean it.A. as; asB. so;

问题补充：

— The classroom is clean it was yesterday.

— Sorry, I forgot to clean it.

A. as; as

B. so; as

C. not as; as

D. more; than

答案：

A. as; as

B. so; as

(答案→)C. not as; as

D. more; than

解析：as; as和……一样；so; as和……一样，一般用于否定句中；not as; as不如；more; than比……多。句意：教室不如昨天干净。——抱歉，我忘了打扫。结合语境可知选C。