题目内容
5. It's said that they have swum to the island fi'om the continent, but they because the ocean in between is too wide. (do)
据说他们从大陆游到了那个岛屿,但是由于中间的海峡太宽,他们不可能做到。
5. can't / couldn't have done it / so / that / this 考查情态动词表推测的用法。从前半句可以看出是对已经发生的事情进行推测,且本题为否定,因此要用carTt / couldn't have done,一定不能用mustn,t have done形式,
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