------_____ have you been swimming?-------Two hours A.When B.Where C.How long D.How many选什么,为什么,

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------_____haveyoubeenswimming?-------TwohoursA.WhenB.WhereC.HowlongD.Howmany选什么,为什么,------_____have

------_____ have you been swimming?-------Two hours A.When B.Where C.How long D.How many选什么,为什么,
------_____ have you been swimming?-------Two hours A.When B.Where C.How long D.How many
选什么,为什么,

------_____ have you been swimming?-------Two hours A.When B.Where C.How long D.How many选什么,为什么,
------(C.How long) have you been swimming?-------Two hours.
你游了多久了?游了两小时.
how long用于对一段时间提问.

- - - - - - _____你游泳吗?- - - - - - -两个小时。当B。其中c。多久D。有多少

选C。A答案不用再现在完成时态中,通常用于过去时或一般现在时。B是对地点提问的特熟疑问词。C是对时间的提问。D是对可数名词的数量提问。根据回答两小时,故选C