[討論] 介系詞問題求解

[k101646 (有夢最美 失望相隨)]

Does anybody can tell me the correct answer and why:

----- seeing their parents, they ran to meet them.
1. By
2. in
3. At
4.on

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推 lijohn      : 4？
推 donsong89   : 我覺得是in , in+ving表示就在...時
推 anikhtoe    : on ,on 後Ving
推 beckhon     : On?
推 blackkaku   : at
推 Meifan      : On.  On / Upon + Ving, ~ = As soon as S v,  ~
→ Meifan      : 一 ～ 就 ～
推 Pao1995     : on 因為等同upon
→ k101646     : On是最多人選目前，我不是很確定
推 vincentman  : on/upon + Ving，S+V。一…就…
→ monofather  : Does anybody can...?
推 SKKhan      : on seeing= at the sight of 一看見...
推 handsomebp  : On
推 dil79975    : On
→ k101646     : 謝謝大家幫忙
推 kee32       : 2樓背錯了，記得要改