问题描述：
this is one class you do not fall asleep in,这个句子是定语从句吧,那以介词in结尾,前面不是要用which
前面不是要用which吗,是不是要这样才完整：this is one class which you do not fall asleep in?
前面不是要用which吗,是不是要这样才完整：this is one class which you do not fall asleep in?
问题解答：
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