■ which

本来 which 是个关系代词，也可以指前面说过的全部内容而不是对应前面的某一单独成分。

• She said it was an accident, which I know is not true.说那是一次事故，但我知道并非如此。

但是，which 还可以跳跃到下一句，仍然指前一句的全部内容。

• Some say we must accept the proposal. To which our response should be the following...人说我们应该接受那个建议。对此，我们的应该作如下回答…
• The DNA code from a stray cell or two is as unique a personal document as any birth certificate—and indefinitely more revealing about personal characteristics, including disease risks. All of which makes experts worry that biorepositories are proliferating without enough attention to consent, confidentiality, and security. (US News & World Report, Dec. 2, 2002, p.58)来自一两个迷失细胞的 DNA 密码，就像任何一份出生证一样，是个人特有的证件，而且比出生证更加无限多地显示个人的特征，包括患病的风险。这一切，使得专家们担心，种种生物储藏库会遍地开花，而对于需要得到本人同意、需要保密、需要安全，则重视不够。

因此，遇到以 which 开始的句子，如果本句的结构解释不通（是 which 在句首而不是疑问词时）就要看看这个 which 是不是上一句的“遗产”。