Question

英语 定语从句

women_____drink more than two cups of coffee a day have a greater change of having heart disease than those_____don't.
A who;不填 B不填;who Cwho;who D 不填；不填
（答案是选C，但为什么those还要用定语从句，就比如说I have more books than you do.，than是连词了？）

Answer 1

change是chance之误。

先把两个定语从句去掉，主句就好理解了：
Women have a greater chance of having heart disease than those (have a chance of having heart disease).
这里我把原文省略的than后面的句子补全了。这跟你的例子I have more books than you do是一样的结构。现在这句的意思是妇女得心脏病的可能性大于妇女得心脏病的可能性。因为没有定语从句了，两个主语变得一样了。现在把定语从句放回去：
Women who drink more than two cups of coffee a day have a greater chance of having heart disease than those who don't (, have a chance of having heart disease).
这样两个定语从句就明确了。第一个是说喝咖啡的，第二个是说不喝咖啡的。

Answer 2

第二个空的these.是先行词，是women的代词，不可少的。

Answer 3

those在这里是指代前面第一个先行词women.
这句话的主语应该是：women have a great change ……than those wemen。