I don’t know the reason ________ he looks unhappy today.A．whereB．thatC．whyD．when-组卷网

题型：单项选择难度：0.65 引用次数：133 题号：13730626

I don’t know the reason ________ he looks unhappy today.

A．where

B．that

C．why

D．when

20-21高一下·新疆喀什·阶段练习查看更多[1]

更新时间：2021-08-21 13:02:17 |

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【知识点】关系副词why引导限制性定语从句

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