一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned

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一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned

一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned
一到英语选择
The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.
A.will function B.are functioned
C.is functioning D.has functioned

一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned
C 飞机上黑匣子是必需的,它能记录飞机的速度,方向以及飞机上的一切是否运作正常.is functioning 表示现在进行时,表示一种状态,现在进行的状态.
will function 是将来时.are functioned 是被动形式,放在这里不适合.has functioned 是完成时.表示过去的状态.在这里也不适合.
有时候用排除法也是很好用的.

C 黑匣子是飞机上的必备设备,它能记录飞机的(飞行)速度、方向以及飞机上的一切是否都在正常运行。

选D, 这里function normally 表示运转正常,不能用被动语态。然后黑盒子是记录之前发生的事,所以用完成时

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