It is essential that everyone_______ safety procedures in the event of an emergency.

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问题 It is essential that everyone_______ safety procedures in the event of an emergency.

选项 A、follow
B、followed
C、following
D、be followed

答案A

解析 essential是作出理性判断时使用的形容词,意思是“必要的”。因此.应有一个表示“应当做某事”的should与之搭配。但这里被省略了。所以空格内应填入动词原形。当然,主动语态和被动语态也要仔细考虑一下。necessary,important,imperative也和essential是类似的用法!
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