Mary doesn't kown which one she should buy.
问题描述:
Mary doesn't kown which one she should buy.
答
Mary doesn't know which one to buy.
答
玛丽不知道她应该买哪一个mary does not know which one to buy
答
首先明白简单句的概念,就是句子中只有一个主语(包括并列主语)和一个谓语(包括并列谓语),其他成分则是单词或短语构成.
Mary doesn't know which one to buy.