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at可以放在句首接doing表示“一.就.”么

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at 可以放在句首接doing 表示“一.就.”么
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答案和解析
应该是on/upon.
On arriving home he called up Lester.他一到家就给莱斯特打电话.
= As soon as he arrived home,he called up Lester.
at也可以在以下用法中表示类似的意思.
She turned away in horror at the sight of so much blood.
她一看见这麽多血就立刻吓得转过脸去.
At the thought of being sent to prison,he shook with fear.
他一想到被送进监狱,就吓得发抖.