The scientist wants to tell people ________.A.how important is it to protect our environmentB.how important it is to protect our environmentC.how important to protect our environmentD.how important is to protect our environment
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B解析考查宾语从句的语序及it作形式主语，不定式作真实主语。由句意“科学家们想要告诉人们保护环境有多么重要”。可知B项正确。