_____ the technicians in the technology department wondered was how to install the data storage device.

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问题 _____ the technicians in the technology department wondered was how to install the data storage device.

选项 A、That
B、Whether
C、Though
D、What

答案D

解析从空格开始到"wondered"为句子的主语，要能够把握这一点。空格处的单词不但作为连词引导充当主语的名词从句，同时还在含有空格的从句中充当动词"wondered"的宾语，因此本身含有先行词在内的关系代词D为正确答案。

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