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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.“做某事有困難”。句意“你意識到我們在解決這個(gè)問題時(shí)，遇到的困難嗎？”根據(jù)固定句型可知，選D。
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