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    精英家教网 > 高中英语 > 题目详情
    4．Many bad habits can be especially difficult to cure because they are likelyto have been formed at a very young age．（form）．
    许多坏习惯特殊气味难以纠正，因为它们可能是人们在年幼时就形成了的．

    分析 be likely to属于固定短语，由于habits和form之间是被动关系，又因为是在"年幼时就形成了的"，综合这三点，空里的内容应该用不定式的完成时态，即"to have been done"结构．

    解答 答案：to have been formed

    点评 考查现在完成时的被动语态．根据时间状语确定时态，由于固定结构"be likely to"，所以用不定式的完成时态．

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