题目内容

It was not until 3 days later that the boy came back to life and explained to the police what_______ to him.
A．was happeningB．was to happen C．had happenedD．has happened
C
考查时态。句意为：两个星期后，那个男孩才苏醒过来，向警方解释到底发生了什么事。happen发生在explain之前，是“过去的过去”，用过去完成时。
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