单选题
Date: March 10
To: All JPC employees
The department heads convened last Tuesday to discuss how to reduce overhead costs. We were surprised that last quarter"s energy consumption was considerably high. Therefore, all employees are advised to eliminate the unnecessary consumption of electric power.
First, please don"t forget to turn off lights when they are not in use. At the end of the working day, each room ______ by the last person to leave it. ______, the maintenance department requests employees unplug any personal electrical appliances that use heat (such as coffee machines) before leaving for the day. Company computers, printers, copiers and ______ office equipment not designed to provide heat can remain connected to power sources.
Steven Hamilton
Office Managing Director
【正确答案】
B
【答案解析】[解析] 语法：动词形态
1．空格应填入的动词check(检查)，由于其宾语each room位于主语位置，因此应该使用被动语态。
2．时态上要表示以后应该做的事，因此应填入should be checked。