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    Although everything seems to have been taken into consideration, ________    accident can happen when the astronauts walk in   ________   space.

    A．/; the

    B．an; the

    C．the; the

    D．an; /

     

    【答案】

    D

    【解析】考查冠词。第一空填不定冠词表泛指，第二空space“太空”前不加冠词，故选D项。

     

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