24．The accident _______ yesterday was caused by carelessness．
24．Theaccident_______yesterdaywascausedbycarelessness．A．happenedB．havinghappenedC．whi...
24．The accident _______ yesterday was caused by carelessness．
A．happened B．having happened C．which happened D．happening
为什么不选D 展开
A．happened B．having happened C．which happened D．happening
为什么不选D 展开
6个回答
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happen一般不用进行时
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