英语：现在完成时应该什么时候使用?还有I have been doing这种形式又应该何时使用?
人气：210 ℃ 时间：2020-01-31 04:06:38
解答
■表示到现在为止已发生或完成的动作,其结果的影响现在依然存在.有时与just,already,yet,recently,before,twice,three times等时间状语连用■表示从过去某一时刻开始一直持续到现在的动作或状态.常与“since+时间点...
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