Do you think the presidential election between Obama and Romney is worthy?A. discussingB.

问题补充：

Do you think the presidential election between Obama and Romney is worthy?

A. discussing

B. to be discussed

C. to discuss

D. being discussed

答案：

A. discussing

(答案→)B. to be discussed

C. to discuss

D. being discussed

解析：考查固定词组。固定词组 sth be worthy to be done=sth be worthy of being done某事值得被做；句意：你认为在奥巴马和罗姆尼之间的竞选值得被讨论吗？故B正确。