she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?

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shewroteherownsentences___(use)thegrammarshewaslearning.用using还是used?为什么?shewroteherownsentences___(

she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?
she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?

she wrote her own sentences ___(use) the grammar she was learning.用using还是used?为什么?
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.