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Yesterday they( )(have) at school

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Yesterday they( )(have) at school
had been
再问: Nancy is going to _________(play) piano at the concert.
再答: play be going to do 表示一般将来时
再问: How________(do) she go back home in the afternoon? listen!there is someone ————(sing)in that building
再答: did yesterday时间状语,一般过去时 listen。进行时的标志。singing