have been more than

I________havebeenmorethansixyearsoldwhentheaccidenthappened．A.shouldn'tB.couldn'tC.mu... I ________ have been more than six years old when the accident happened．
A.shouldn't
B.couldn't
C.mustn't
D.needn't 展开

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#热议# 空调使用不当可能引发哪些疾病？

希雅登英韶
2020-05-01 · TA获得超过1152个赞

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答案B
shouldn't have done不应该做而实际上做了；couldn't have been不可能是……；needn't have done没必要做某事而做了；此外无mustn't have done结构,结合句意可知B项正确．

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have been more than

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