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  3. It is essential that the program ____________ be loaded into computer.A.should B

It is essential that the program ____________ be loaded into computer.A.should B

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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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