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    精英家教网 > 高中英语 > 题目详情
    The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally.
    A．will functionB．functionedC．is functioningD．has functioned
    C

    这题考查时态：句意是：黑匣子在飞机上是一个必要的设备，记录它的速度，方向和飞机上的一切是否正常运作。表示在飞机飞行过程中的情况，用现在进行时。选C。
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