一道英语题（虚拟语气）She insisted that a doctor _____ immediately.be s

答案：be sent for 或 should be sent for
翻译：她坚持应该立刻（派人）去请一个医生.
1.固定短语 send for somebody,意思是“（派人）去请某人”,用在此题中即为send for a doctor；
采用被动语态即为：a doctor be sent for immediately
2.insist引导宾语从句时,如果从句动作当时尚未发生,则从句必须使用虚拟语气,即从句的谓语动词由“should + 动词原形”构成,且should可以省略.
则该题答案进一步变为：She insisted that a doctor should be sent for immediately；
3.因为should可以省略,所以此句答案也可以是：
She insisted that a doctor be sent for immediately.
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填原型，insist表坚持从句用（should）+原型，should常省略

她坚持立即去请医生 是这个意思吗？？