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  3. This is the air conditioner______we have had so much trouble.

This is the air conditioner______we have had so much trouble.

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问题 This is the air conditioner______we have had so much trouble.
选项 A、at which
B、of which
C、to which
D、with which
答案D
解析 考查定语从句。先行词the air conditioner在从句中作宾语，又根据have trouble with sth．可知D项正确。
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