很高兴为您解答如下：
The man stopped me and asked what had happened 那个人拦住我问之前发生了什么.
不可以
因为主句的时态是一般过去式,并且动作stoped和asked两个动作都发生在happen之后,即happen是过去的过去,所以应该用过去完成时 had happened
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