这句话有什么错误: by reading instructions carefully ,mistakes in the examination can be avoided?
问题描述：
这句话有什么错误: by reading instructions carefully ,mistakes in the examination can be avoided?
请详细回答,感激不尽.
是by doing 。。这里错了 但不知为何 。。by 引导的方式状从，我觉得挺说得通的啊
答
很明显 前后主语不一致