23.24.25
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23.24.2523.24.25 23.24.2523、(Have)they(beenswimming)since3o''clock?24、(Wherehave)you(beenstaying
23.24.25
23.24.25
23.24.25
23、(Have) they (been swimming) since 3 o'clock?
24、(Where have) you (been staying) for two weeks?
25、She (had been practicing) playing the piano (for two hours).\
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将楼上的修改一下：（仅供参考，呵呵！）
Have they been swimming since 3 o'clock?
Where have you been staying for two weeks?
She 【has】 been practicing playing the piano for two hours.