It is necessary that he (come) ______ back without delay.

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问题 It is necessary that he (come) ______ back without delay.

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答案(should)come

解析 虚拟语气可用于主语从句,这类主语从句的一般形式为:It is/was+引起虚拟浩气的形容词或过去分词+含虚拟语气的主语从句。这类主语从句常常用于表示要求、建议、命令、请求、提议等,其谓语形式往往为“(should)+动词原形”的形式。可以引起虚拟语气的形容词和过去分词有:important, necessary, natural, possible, essential, vital, appropriate, imperative, probable, interesting, strange, odd, sorry, surprising, advisable, desirable, urgent和desired, advised, decided, required, proposed, ordered, demanded, requested, insisted, arranged, suggested, moved等。
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