-Look at the sign smoking isn't allowed here.__oh,sorry,I___it

问题描述:

-Look at the sign smoking isn't allowed here.__oh,sorry,I___it
A don't notice B.didn't notice C wasn't moticing D couldn't notice

答案是选D,意思是说,我刚才没能注意到这个标志.
祝更上一层楼.为什么不选B呢。不是过去时么不应该用过去时,因为人家提醒,是现在提醒,所以不能用过去时,也就是说他现在正抽烟,所以人家才提醒,不是他抽完烟了,人家才提醒的,所以这里不涉及过去时,could表示语气委婉希望帮助到你,祝更上一层楼。