How long have you been collecting shells?与How long have you collected shells?的区别
还要介绍一下现在将来时!
人气：199 ℃ 时间：2019-10-08 09:59:26
解答
How long have you collected ...这是现在完成时,强调这件事现在已经完成了,问已经收集贝壳收集了多久,暗示接下来不收集了,或不收集的可能性很大.How long have you been collecting ...表示收集贝壳的事,从过去收集...
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