had been 用法.He waved desperately to his companion,who had been water skiing for the last fifteen minutes.who 是引导非限定性定语从句,那么had been 在这里是什么时态?
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![had been 用法.He waved desperately to his companion,who had been water skiing for the last fifteen minutes.who 是引导非限定性定语从句,那么had been 在这里是什么时态?](/uploads/image/z/13497621-69-1.jpg?t=had+been+%E7%94%A8%E6%B3%95.He+waved+desperately+to+his+companion%2Cwho+had+been+water+skiing+for+the+last+fifteen+minutes.who+%E6%98%AF%E5%BC%95%E5%AF%BC%E9%9D%9E%E9%99%90%E5%AE%9A%E6%80%A7%E5%AE%9A%E8%AF%AD%E4%BB%8E%E5%8F%A5%EF%BC%8C%E9%82%A3%E4%B9%88had+been+%E5%9C%A8%E8%BF%99%E9%87%8C%E6%98%AF%E4%BB%80%E4%B9%88%E6%97%B6%E6%80%81%EF%BC%9F)
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