[正] I haven't seen you since the beginning of the summer holidays.
[析] during表示在某一段时间之内,所以一般不与完成时搭配,如:I visited a lot of museums during the holiday. 而for表示一段时间,可以用于完成时,如:I haven't see you for a long time. 而through 用来表示时间时则为"整整,全部的时间"。如:It rained through the night. 而since则是表达主句动作的起始时间,一般要与完成时连用。
[误] At entering the classroom, I heard the good news.
[正] On entering the classroom, I heard the good news.
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