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问题: 六级英语词汇选择题

The police went into action ___ they heard the alarm.
A. promptly B. presently C. quickly D. directly

解答:

选D.四个词都可表示“立刻”,但后面是一个句子,direcetly可以引导时间状语从句,相当于as soon as
“警察一听到警报声,就立刻采取行动。”