单选题11. A fire extinguisher must be kept ______ in kitchens regardless of how many workers the restaurant employs.
【正确答案】
D
【答案解析】 选项A错误，keep in mind意思是“把……记在心上”，比如计划。选项B错误，keep on file意思是“把……归档留存”，比如简历。选项C不合逻辑，keep getting stuck意思是“频繁被中断”。选项D正确，keep within reach意思是“保持触手可及(以防万一)”。