求详细解答：Many accidents _____

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Many accidents ______ by careless drivers last year.	[ ]
A. are caused B. were caused C. have caused D. will cause

Many accidents happen at cr___. Bad driving--------(cause) many accidents. There are t______(1)many accidents in cities.Accidents ofen 求详细解答过程。求详细解答过程求老师详细解答！化学求详细解答求老师详细解答求详细解答。求详细解答两小题求详细解答为什么求解答详细过程