The black box is a necessary device on an airplane, which records its speed, dir
题型:不详难度:来源:
The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally. A.will function | B.functioned | C.is functioning | D.has functioned |
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答案
C |
解析
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。 |
举一反三
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