题目内容：

To earn money for his education,Tom has to take on more work than ______ good for his health.
选项：A.to be　　　　B.that is　　　　C.which　　　　D.is　　这道题选啥?

优质解答

B. that is 是修饰省略掉的than 后面的the work的,意思是Tom为了上学必须做超过他身体能够承受的工作.如果说全了就是Tom has to take on more work than the work that is good for his health.