请问:they did not do what they are doing.前边是过去时,从句用现在时吗?我也纳闷,书上写的。
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![请问:they did not do what they are doing.前边是过去时,从句用现在时吗?我也纳闷,书上写的。](/uploads/image/z/12223773-45-3.jpg?t=%E8%AF%B7%E9%97%AE%3Athey+did+not+do+what+they+are+doing.%E5%89%8D%E8%BE%B9%E6%98%AF%E8%BF%87%E5%8E%BB%E6%97%B6%2C%E4%BB%8E%E5%8F%A5%E7%94%A8%E7%8E%B0%E5%9C%A8%E6%97%B6%E5%90%97%3F%E6%88%91%E4%B9%9F%E7%BA%B3%E9%97%B7%EF%BC%8C%E4%B9%A6%E4%B8%8A%E5%86%99%E7%9A%84%E3%80%82)
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