问题描述：
在改写的句子空格上填写适当的词,使句子完整并与原句意思相符,每空限填一词.
Peter joined the singing group two months ago.
Peter ____ _____ in the singsing group for two months.
不是应该had been吗
Peter joined the singing group two months ago.
Peter ____ _____ in the singsing group for two months.
不是应该had been吗
问题解答：
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