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请问joinin的宾语为什么省略了?Thegirlonthebusbegantosingasongandsoonalltheothersjoinedin.另外什么情况下能省略呢?

题目详情
请问join in的宾语为什么省略了?
The girl on the bus began to sing a song and soon all the others joined in.
另外什么情况下能省略呢?
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答案和解析
The girl on the bus began to sing a song and soon all the others joined in (her singing).
省略的应是her singing.前文提及,下文不说也明白,且不违反语法或其它规则的才可省略.