By the time they got to the guake-stricken area,the rescuers--------what difficulty they would have helping the victims out.A.sensed B.had sensed C.had been sensing D.were sensing请问：为什么?

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By the time they got to the guake-stricken area,the rescuers--------what difficulty they would have helping the victims out.A.sensed B.had sensed C.had been sensing D.were sensing请问：为什么?
By the time they got to the guake-stricken area,the rescuers--------what difficulty they would have helping the victims out.
A.sensed B.had sensed C.had been sensing D.were sensing
请问：为什么?

By the time they got to the guake-stricken area,the rescuers--------what difficulty they would have helping the victims out.A.sensed B.had sensed C.had been sensing D.were sensing请问：为什么?
因为他们到了之后才意识到救援很困难. 都是讲述过去, 因此直接用过去式即可. 主句不存在动作上的早先完成

答案选B
很简单，记住了，只要看到有by或者by the time引导的时间状语，后面的主干句要用完成时。若by后面是现在时，主干句用现在完成时；若by后面是过去时，主干句则用过去完成时。本题属后者。
本句翻译：当他们到达那个guake-striken区域时，营救者们就已经感觉到了把受害者们救出来所要面对的困难。...

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答案选B
很简单，记住了，只要看到有by或者by the time引导的时间状语，后面的主干句要用完成时。若by后面是现在时，主干句用现在完成时；若by后面是过去时，主干句则用过去完成时。本题属后者。
本句翻译：当他们到达那个guake-striken区域时，营救者们就已经感觉到了把受害者们救出来所要面对的困难。

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一般情况下是by the time 后加过去完成时,这题不能因思维定势选B,因为是earthquake先发生,故后半句不能用过去的过去.

他们到达受损灾区后 营救人员才发现把难者营救出来是多么困难
是在他们带大之后的一个行为 而got to 是用的一般过去时 所以用一般过去式
如用had sensed 则表明 在got to 的以前就已经感觉到 had been sensing 就是过去一直在感觉到 是个持续性的 were sensing 是指在过去的一个准确时间正在感觉到 后面一般加时间状语 但用在这也...

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他们到达受损灾区后 营救人员才发现把难者营救出来是多么困难
是在他们带大之后的一个行为 而got to 是用的一般过去时 所以用一般过去式
如用had sensed 则表明 在got to 的以前就已经感觉到 had been sensing 就是过去一直在感觉到 是个持续性的 were sensing 是指在过去的一个准确时间正在感觉到 后面一般加时间状语 但用在这也不符合语境

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一开始会误以为是选B吧。。
By the time表示的是到什么的时候，而后面的从句里显示的是过去的时间。但是你想一下，救护人员是先明白有多困难还是先到达那个地方呢？句意里应该是先到那里然后才明白。所以选A
当然，By the time还是多用完成时的。不过还是得看句意。。...

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一开始会误以为是选B吧。。
By the time表示的是到什么的时候，而后面的从句里显示的是过去的时间。但是你想一下，救护人员是先明白有多困难还是先到达那个地方呢？句意里应该是先到那里然后才明白。所以选A
当然，By the time还是多用完成时的。不过还是得看句意。。

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B.had sense -dhad 已经是过去式不用再加ED
C.had been sensing完成时。
D.were sensing were是 are和am的过去式

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