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    ---The two astronauts had been trained for long before they flew to space. --- Oh, they quite a lot of difficulties. A. might go through B. may go through C. should have gone through D. must have gone through 【查看更多】

     

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    －The two astronauts had been trained for long before they flew to space．

     －Oh，they     quite a lot of difficulties

        A．might go through                       B．may go through

        C．should have gone through           D．must have gone through

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