Seeing his mother, the little boy stopped crying.
看到了妈妈，小男孩就停止了哭泣。
这是一道多选题
答案是
.A. At the sight of B. On seeing C. The moment he sawD. As soon as he saw
都对。
at the sight of “一看见”，
“一看见妈妈，小男孩停止了哭泣。”
at the sight of....一看见....
可以改写为：on/ upon seeing his mother.
一看见母亲，这小孩就不哭了。
一看见他的妈妈，小男孩就停止哭泣
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