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【题目】I have no idea ________ the cell phone isn’t working, so could you fix it for me?
A.what
B.why
C.if
D.which

【答案】B
【解析】句意:我不知道为什么手机不能工作了,你能帮我修修吗?根据句子结构可知,后面的从句是一个同位语从句,作名词idea的同位语,根据句意可知,选择B项。

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