---You realize that you were driving at 100 miles per hour,don't you?---No,o
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---You realize that you were driving at 100 miles per hour,don't you?
---No,officer,I ________ have been．This car can't do more than 70．
A.needn't
B.couldn't
C.shouldn't
D.might not
试题答案
B
考查情态动词，have been后省略了driving at 100 miles per our．情态动词couldn't — have done表示不可能做了某事。