The fire alarms are checked______to ensure that they work properly in case of an emergency.

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问题 The fire alarms are checked______to ensure that they work properly in case of an emergency.

选项 A、recently
B、almost
C、every
D、regularly

答案D

解析 词汇:副词1.这是一道词汇题,选项均为副词。2.原文意思是“定期被清点”,因此(D)为正确选项。
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