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问题: 定语从句么...

Why don't you look up in the dictionary?
_____ you don't know it ?
这里选that,请告诉我这是定语从句吗.还是其它从句.
不想在网上搜,请各位分析一下.

解答:

Why don't you look up in the dictionary_____ you don't know it ?
你选that,能说明理由吗.你能核对原题,把所有选项列出?这个答案似乎有些问题
Why not look up the new word in a dictionary _____________you don't know it?
应该用if,条件状语从句.