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    精英家教网 > 高中英语 > 题目详情
    ________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
    A．Having explainedB．Having been explained
    C．Though it was explainedD．It was explained
    D
    因为有连词but，前面应是完整的句子，排除A,B; Though不能和but同时使用，所以选D。
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