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  3. According to the regulation, inspections ___________to ensure that the systems are in good condition.

According to the regulation, inspections ___________to ensure that the systems are in good condition.

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问题 According to the regulation, inspections ___________to ensure that the systems are in good condition.
选项 A、demanded
B、have demanded
C、be demanded
D、are demanded
答案D
解析 根据句意和从句中的are可知，主句应用一般现在时。又因inspections和demand之间是逻辑上的动宾关系，所以应用一般现在时的被动语态，即谓语动词用“am/is/are+过去分词”的形式。故选D。
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