1.exhausted，精疲力尽的，这里是作伴随状语，表示我们的状态，ing往往修饰物，ed修饰人。
2.be supposed to do：应该做，be supposed to be doing：应该正在做，表示动作正在进行；
be supposed to have done：应该已经做了，表示动作发生在过去；
3yet，是一个提示，完成时态中yet用于疑问句和否定句中，...
1,Having walked in the desert for several days ,we finally r
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