问题
选择题
I have learned that clothes ______ online are of poor quality.
A．bought
B．buying
C．to buy
D．having bought
答案
答案：A
题目分析：句意：我已经知道网上买的衣服质量差。这里需要定语修饰clothes，因为clothes和buy是被动关系，用过去分词做定语，所以选A.
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