she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?
题目
she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?
答案
using
she wrote her own sentences （which are using） the grammar she was learning.
省略后就成了using,同时是主动形式.used是被动形式（过去分词的作用）,应该是人用.就不能像本题的选择一样表示修饰了.
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