___ it have been wrong directions from the control room that

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___ it have been wrong directions from the control room that caused the air crash?
A. Must B. Could C. Would D. Should 请教各位这题选什么以及为什么.

选B,Could.
对过去情况进行【可能性推测判断】,【疑问句】中只有【can,could】两种形式.
原句本身是个【一般疑问式的强调结构】,
【Could】 it have been wrong directions from the control room 【that】 caused the air crash?
句意：可能是来自控制室的错误指示导致这起飞机坠毁事件的吗?
如果还原为陈述形式,答案会有所变化—
It 【must_】_ have been wrong directions from the control room that caused the air crash.
一定是来自控制室的错误指示导致这起飞机坠毁事件.

___ it have been wrong directions from the control room that The room ___ a stale air.It must have been vacant for a long 英语改错求帮忙i have been learned it from the internet that you wan 语法：We regret to find that the wrong goods have been .. It was ___ that made me ___ in the room last night the room is in the terrible mess ,it can not have been clean I con't find the recorder in the room.It may have been taken Though laws have been passed to control the population growt it's time for you to break away from any“rope”that have been The room must have been cleaned by Tom yesterday,________ it The room is in a terrible mess；it（）have been cleaned for a Better to wrong the world than have it wrong