I have been more than six years old when the accident happened. [ ] A. shouldn't
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![I have been more than six years old when the accident happened. [ ] A. shouldn't](/pic/43_782995.jpg)
I ________ have been more than six years old when the accident happened.
[]A.shouldn't
B.couldn't
C.mustn't
D.needn't
试题答案
答案:B