This is the house inwhich Lu Xun once lived
= This is the house（that / which )Lu Xun once lived in.（　引导词作宾语）
=This is the house( that / which ) Lu Xun once lived in　　（引导词作宾语）
= This is the house( where )Lu Xun once lived .(　　引导词作状语)
=This is the hours in (which ) Lu Xun once lived. (介词后不能用that)

注：第一、二句相同呀,我补了最后一句,楼主注意看哦.

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