Seing John run into the room,I asked him what__A would happened B had happened C happened D was happenedC还是 B 给我理由

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Seing John run into the room,I asked him what__
A would happened B had happened
C happened D was happened
C还是 B 给我理由

B 我在过去的某一时间问他:刚才发生了什么?是过去的过去,所以用had

选B
过去完成时,因为主句是一般过去时,所以从句要退一格

c