问题

I’m sorry,but there’s no smoking on this flight.—Oh,I _______ that.Sorry, I won’t again
A:don’t know
B:didn’t know
C:won’t know
D:haven’t known
B:didn’t know
C:won’t know
D:haven’t known
正确答案是:
同类题型
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mber of people, who haveaccess to their own cars, sharply in thepast decade.
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