I never doubt the places of interest is worth .A. whether; visiting B. that; to visitC. w

问题补充：

I never doubt the places of interest is worth .

A. whether; visiting

B. that; to visit

C. whether; a visit

D. that; a visit

答案：

A. whether; visiting

B. that; to visit

C. whether; a visit

(答案→)D. that; a visit

解析：句意：我从不怀疑名胜古迹值得参观。动词doubt后面接了宾语从句，never dount从不怀疑；whether是否，这和句意不符；that引导宾语从句不做成分；be worth visiting 值得参观，或者接名词worth a visit；结合语境故选D。