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    2020考研英語：語法過去完成進行時篇
    過去完成進行時
    had been + 動詞的現(xiàn)在分詞。
    用法：表示一直持續(xù)到過去某個時間的行為動作，此行為動作或剛結束、或還沒結束(可以從上下文看出)。這一時態(tài)經常與一般過去時一起使用。例如：
    When he came in, I had been trying to repair the TV for a couple of hours. 他進來的時候，我一直在努力修理電視機好幾個小時了
    The roads were dangerous. It had been raining for two whole days. 道路很危險。雨一直下了兩整天。
    They were tired because they had been digging since dawn. 他們累了，因為從天亮開始他們就一直在挖。
    The boy was delighted with the new mountain bike. He had been hoping for one for a long time. 那男孩得到一輛新山地自行車很高興。很長時間來他一直希望有一輛。