I think the talk given by the old scientist is worth .A. very to listenB. well listenin

问题补充：

I think the talk given by the old scientist is worth .

A. very, to listen

B. well, listening

C. very, to listen to

D. well, listening to

答案：

A. very, to listen

B. well, listening

C. very, to listen to

(答案→)D. well, listening to

解析：考查worth的用法。be well worth doing sth.“很值得做某事”，well修饰worth。句意“我认为那位老科学家的演讲很值得一听。”故选D。