The majority of doctors smoking is harmful to health.A. are believedB. had believedC. has

问题补充：

The majority of doctors smoking is harmful to health.

A. are believed

B. had believed

C. has believed

D. believe

答案：

A. are believed

B. had believed

C. has believed

D. believe

解析：句意“大多数医生相信吸烟有害健康”。the majority of +复数名词作主语，用复数；而根据句意，该句是在说明一个客观事实，应该用一般现在时。