I have no idea ________ the cell phone isn’t working, so could you fix it for me?
A．whatB．whyC．ifD．which
B
根據(jù)句子結(jié)構(gòu)可知，后面的從句是一個(gè)同位語從句，作名詞idea的同位語，句意為，我不知道為什么手機(jī)不能工作了，你能幫我修修嗎？根據(jù)句意可知，選擇B項(xiàng)。
【考點(diǎn)定位】考察名詞性從句（同位語從句）
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