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    He explained________us what had happened________him.

    A．to；to                                                B．to；for

    C．for；to                                              D．with；for

    【答案】　A

    　考查介词用法。explain sth.to sb.或explain to sb.sth.表示“向某人解释某事”；sth.happen to sb.表示某人出了某事，故应选A项。

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