高一英语同义句转换
问题描述：
高一英语同义句转换
By the 1920s,he had become an famous explorer.
By the 1920s,he had ______ famous explorer.
答
By the 1920s,he had become an famous explorer.
=By the 1920s,he had (turned) famous explorer.
注：turn sb中间无须冠词.