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9. It is essential that every student()the safety rules.A. obeyB. obeysC. obeyedD. will obey

9. It is essential that every student()the safety rules.

A. obey

B. obeys

C. obeyed

D. will obey

题目解答

答案

A. obey

解析

本题考查虚拟语气的用法，核心在于掌握It is essential that结构的固定句式。
关键点：

It is essential that结构中，从句需使用动词原形或should + 动词原形（虚拟语气）。
主语单复数不影响动词形式，即使主语是单数（如本题中的every student），仍需用动词原形。
其他时态（如一般现在时、过去时、将来时）均不符合句意。

选项分析

A. obey

符合动词原形要求，正确体现虚拟语气。

B. obeys

第三人称单数形式，属于一般现在时，与虚拟语气结构矛盾。

C. obeyed

过去式，表示已完成的动作，但句中强调“必须遵守规则”这一当前要求，不符合逻辑。

D. will obey

表示将来动作，与句中“essential（必须）”的强制性要求不符。

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