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    精英家教网 > 高中英语 > 题目详情
    Have you realized the difficulty we have ____ the problem?
    A．worked out B．to work outC．work outD．working out
    D
    考查固定句型。have difficulty/trouble (in) doing sth.“做某事有困难”。句意“你意识到我们在解决这个问题时，遇到的困难吗？”根据固定句型可知，选D。
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