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

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

admin2011-03-11  77
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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