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

    A．不填；theB．an；不填C．the；theD．an；the

    B

    解析试题分析：第一空表泛指，并没强调是哪起事故，故用不定冠词an，in space 在太空上，为固定短语。句意：尽管一切事情都已考虑，但宇航员在太空行走时还是有可能发生事故。
    考点：冠词习惯用法
    点评：解答有关冠词的题型，可以从两方面入手，一是习惯搭配，二是固定短语。对于固定短语平 时应多读多记。

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