--Excuse me, I don't think you can smoke here.
---Really sorry. I ______ this is a non-smoking room.
| A．didn't know | B．don't know | C．have no idea | D．haven't known |
相关试题
Over the past 20 years, the Internet helped change our world in _____way or another for the better.
| A．any | B．one | C．every | D．either |
—Do you want another drink? 
——_______ .
| A．I don’t think so | B．No way | C．Not at all | D．I wouldn’t say no |
he doctor recommended that you______ swim after eating a large meal.
| A．wouldn’t | B．couldn’t | C．needn’t | D．shouldn’t |
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