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这句话有语法错误吗?Thereisnodoubtthatwecanbenefitalotfromthesebookswhen(we)studyEnglishbasedonmyownclassexperiences.when后面可以省we吗?

题目详情
这句话有语法错误吗?
There is no doubt that we can benefit a lot from these books when (we ) study English based on my own class experiences.
when后面可以省we吗?
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答案和解析
正确答案为:
we 可以省略,省略的话要把study变成studying