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

這題考查時(shí)態(tài)：句意是：黑匣子在飛機(jī)上是一個(gè)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(shí)。選C。
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