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。