题目内容

The majority of doctors ______ smoking is harmful to health.
A．are believedB．had believedC．has believedD．believe
D 
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。
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