which/that 引导非限制从句时，用法辨析？
章振邦新编高级英语语法649页：
原句：Every bottle of "BUZZ" has been tested in our laboratories. Which/That is why we're so sure of our guarantee.
是否有误？
请教老师，上面当用That时，指示代词，
Every bottle of "BUZZ" has been tested in our laboratories. That is why we're so sure of our guarantee.
当用which，关系代词，所以
Every bottle of "BUZZ" has been tested in our laboratories, which is why we're so sure of our guarantee.
即which要小写，并且which前是",", 而不是".". 对吗？
或者我的问题是，当which作非限制性用法时，是否which应该小写，并且which应该是",", 而不是"." ?
最佳答案 2020-12-05 12:07
Every bottle of "BUZZ" has been tested in our laboratories. That is why we're so sure of our guarantee. （That 是指示代词）
Every bottle of "BUZZ" has been tested in our laboratories, which is why we're so sure of our guarantee. （which 是关系代词）
Every bottle of "BUZZ" has been tested in our laboratories. Which is why we're so sure of our guarantee. （不是规范的定语从句）
又如：
Looking westward across the great continent
toward sunset, I knew that I had better get up and go back to the lavatory.
Which I did.
关系代词 which ，可以指代主句整个内容或部分内容，一般引导非限定性定语从句（之前有逗号）。偶见使用句号，可以单独成句。
They ran out of drink. Which actually didn't bother me because I wasn't drinking
他们把酒喝完了。但实际上这对我来说无所谓，因为我不喝酒。
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