题目内容

The policemen regretted _______ as soon as possible at the alarm.
A．not taking actionB．not to take measures
C．taking no actionsD．to take no action
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。
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