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Oncatchingsightofachild(struggle)inthewater,Oncatchingsightofachild(struggle)inthewather,themanjumpedintothewaterandsavedhim.

题目详情
On catching sight of a child___(struggle) in the water ,
On catching sight of a child ___(struggle)in the wather,the man jumped into the water and saved him.
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答案和解析
struggling(现在分词作宾补,表示进行)
一看到孩子正在水中(water)挣扎,男子跳进水里并救了他.