题目内容
4．I have learned that clothes ______ online are of poor quality．（ ）| A． | bought | B． | buying | C． | to buy | D． | having bought |
分析 我已经知道网上买的衣服质量差．
解答 答案：A．本句中已有谓语动词have learned，所以这里需要用非谓语动词来作后置定语修饰clothes，动词buy与它的逻辑主语clothes之间是被动关系，故用过去分词做后置定语，所以选A．
点评 本题考查过去分词作后置定语的用法．做这类题型时，首先判断此处是否该用非谓语动词（看句中是否已有谓语动词），然后找逻辑主语，看所填动词与它的逻辑主语之间的关系（过去分词表被动、完成；现在分词表主动、进行；不定式表将来），来决定答案
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