He has been there twice ________ 1982 They stayed here ____ June Semtember

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He has been there twice ________ 1982 They stayed here ____ June Semtember

since.from..to

He has been there twice ____in____ 1982 They stayed here __in __ June Semtember

1.in 2. on
解释:具体的时间用on 不是具体的时间用in

third 句子中已经他去过北京两次了,所以这是他第三次去北京。 what is your question please?