Oh Mary why are you killing your time this way ?Can’t you find something doing at all?A.

问题补充：

Oh, Mary, why are you killing your time this way ?Can’t you find something doing at all?

A. useful

B. valuable

C. worth

D. good

答案：

A. useful

B. valuable

(答案→)C. worth

D. good

解析：考查固定搭配。固定搭配sth be worth doing某事值得被做；本句中worth doing修饰名词something。句意：Mary，为什么你用这种方法来消磨时间呢？你难道就不能找到值得做的事情吗？故C正确。