问题描述：
问一个关于定语从句的问题20
I know a doctor.He is expert in curing stroke.
改成：I know a doctor who is expert in curing stroke.
这样的话没有错误吧.
I know a doctor.He is expert in curing stroke.
改成：I know a doctor who is expert in curing stroke.
这样的话没有错误吧.
问题解答：
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