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    精英家教网 > 高中英语 > 题目详情
    Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.
    A．must go throughB．may go through
    C．must have gone throughD．could have gone through
    C
    考查情态动词。根据题意可知本句为对过去事情的推测，故用情态动词+ have done，根据句意可知must have done过去一定做某事，选C。
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