问题
选择题
— 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
答案
答案：C
根据句意教师忘记打扫应该是不如以前干净，故只能选表示不及的意思，not so
……as可以表示此意，故选C。
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