问题
选择题
The policemen regretted _______ as soon as possible at the alarm.
A．not taking action
B．not to take measures
C．taking no actions
D．to take no action
答案
答案：A
考查非谓语动词。短语：后悔做了某事regret doing sth，否定式应在doing前加not，句意：警察们后悔听到警报后没有尽快采取行动。take action 采取行动，所以选A。