This was a serious accident ____by inexperienced workers

This was a serious accident ____by inexperienced workers

题目
This was a serious accident ____by inexperienced workers
A.caused B.having been caused C.to be caused D.being caused
答案
A 过去分词作定语,意思是一个不熟练工人引起的严重事故.相当于一个定语从句 which was caused by
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