他立刻作了反应。用英语怎么说？

他立刻作了反应。

He had an instantaneous response.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

instantaneous

adj. 瞬间的，即刻的，猝发的；

例句
Death was instantaneous because both bullets hit the heart.
因为两颗子弹都击中了心脏,所以死亡是瞬间发生的。

response

n. 反应，回答，答复，[宗]回应经文，应唱圣

例句
The general response was one of understandable bafflement.
大家的反应是感到困惑，这一点情有可原。