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    --- What happened to the young trees we planted last week?

    ---The trees _________ well, but I didn’t water them.

    A. might grow B. must have grown

    C. would have grown D. would grow

    C

    【解析】

    试题解析：考查虚拟语气。would have done表示对过去已发生的事情的推测，表示对过去事情的假设，译为本来会做，但是没有做，must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句，故排除B,句意：我們上周种的那些新树怎麼樣了？树可能会长的很好吧，但是我沒有去給他們浇过水。故选C。

    考点：考查虚拟语气。

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