请问我的这个有什么语法错误吗?帮忙改正下,
题目
请问我的这个有什么语法错误吗?帮忙改正下,
the primary structure of XG contains pentameric repeat units which was formed by two D-glucose,two D-mannose and one D-glucuronic acid.
Approximately onehalf of the terminals D-mannose contain a pyruvic acid residue linked via keto group to the 4 and 6 positions.这个句子有什么语法错误吗？
答案
稍作改动：
the primary structure of XG contains pentameric repeating units which are formed by two D-glucose,two D-mannose and one D-glucuronic acid
或者
the primary structure of XG contains pentameric repeating units formed by two D-glucose,two D-mannose and one D-glucuronic acid
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units which are formed 中的时态无需过去时.which are 可以省略
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