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

解析這題考查時態(tài)：句意是：黑匣子在飛機(jī)上是一個必要的設(shè)備，記錄它的速度，方向和飛機(jī)上的一切是否正常運(yùn)作。表示在飛機(jī)飛行過程中的情況，用現(xiàn)在進(jìn)行時。選C。

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