23. It is believed that the driver’s carelessness is without doub_英语解答

23. It is believed that the driver’s carelessness is without doubt _____caused the accident.A. howB. whatC. thatD. where

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解答

【B】what,整个句子中宾语从句包含有表语从句,what指代 the driver’s carelessness,这个司机的疏忽大意引发了交通事故.