Due to the hard training theyhad done (do) before.their performance were very impressive．题目和参考答案——青夏教育精英家教网—

9．Due to the hard training theyhad done （do） before，their performance were very impressive．

分析由于他们以前所做的艰苦训练，他们的表现令人印象非常深刻．

解答答案：had done
根据"their performance were very impressive"使用了一般过去时以及时间状语before可知，此处表示发生在过去"他们的表现令人印象非常深刻"之前的动作，所以应使用过去完成时；故用had done．

点评本题考查了过去完成时（had+done）的用法；首先应根据句中已知的时态，时间状语以及句意，判断出此处应使用的时态；其次应了解过去完成时表示的是发生在过去之前的动作．

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