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heworkedinChina()thefifties是in还是on

题目详情
he worked in China ( )the fifties
是in 还是on
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答案和解析
he worked in China ( during )the fifties
如果是选in还是on的话,就选in.
he worked in China ( in )the fifties
翻译为:50年代时期,他在中国工作.