推荐回答（4个）
题主是个高手。不过按你说法，如果是which也不应该用on作介词啊，表示地点应该是in (the hospital) 或者at (the hospital) 。所以出题者是有意下的一个套。反正记住这道题考的是to operate "on" somebody，而不是to operate in the hospital.
这句话的主语是many wounded，而不是关系副词where，关系副词where在句中不能作主语，只能作地点状语。
既然主语是many wounded，它和谓语operate on（动手术）之间是被动关系，当然用be operated on，operate on是一个完整的动词词组，里面的on不能漏掉。
希望我能帮助你解疑释惑。
不是的，many wounded 意思是很多伤员，所以many wounded are operated on是一个完整的被动句句，由where引导的从句，operated on 的对象是wounded
operate on many wounded 意思是给许多伤员动手术
Many wounded are operated on every day in the hospital.
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