It is essential that the program______be loaded into computer.

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问题 It is essential that the program______be loaded into computer.

选项 A、should
B、could
C、must
D、would

答案A

解析 考查虚拟语气。在“It is important(necessary,essential,imperative,urgent,vital,appropriate,advisable)that…”这类句型里,that所引导的主语从句中的谓语动词常用虚拟语气,即should+动词原形,should可以省略。句意为“把程序输入计算机是很有必要的”。故选A。
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