【题目】Emergency line operators must always ________ calm and make sure they get all the information they need to send help.
A.stayB.becomeC.appearD.grow
在线课程【答案】A
【解析】
考查动词。句意：紧急电话接线员必须保持冷静，确保他们得到了需要发送帮助的所有信息。A. stay保持；B. become变得；C. appear出现；D. grow成长。分析句子可知，此处表示“保持冷静”。结合选项，故选A。