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)

據(jù)說他們從大陸游到了那個島嶼，但是由于中間的海峽太寬，他們不可能做到。

5. can't / couldn't have done it / so / that / this 考查情態(tài)動詞表推測的用法。從前半句可以看出是對已經(jīng)發(fā)生的事情進(jìn)行推測，且本題為否定，因此要用carTt / couldn't have done，一定不能用mustn，t have done形式,

題目來源：高考丟分題英語 > 專題訓(xùn)練6:情態(tài)動詞和虛擬語氣

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