The most important thing to keep in mind when dealing with emergency is to stay calm.
A. /; the
B. the; an
C. the; the
D. /; an
网友回答
A. /; the
B. the; an
C. the; the
(答案→)D. /; an
解析：答案：D。考查冠词。句意：一定要牢记处理紧急情况时一定要保持镇静。第一空keep in mind是固定短语，意为“牢记”；第二空an emergency“紧急情况”。