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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