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
考查時態(tài)。句意為：兩個星期后，那個男孩才蘇醒過來，向警方解釋到底發(fā)生了什么事。happen發(fā)生在explain之前，是“過去的過去”，用過去完成時。
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