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    3、 (2011年陕西西安分科质检)After working on the maths problem for hours，he found________he thought was the key to it.

    A．what                            B．that

    C．where                          D．which

    3、解析：选A。what引导的名词性从句作found的宾语从句的主语，而且what在宾语从句中作主语。he thought为插入语。

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     (2011年陕西西安分科质检)After working on the maths problem for hours，he found________he thought was the key to it.

    A．what                            B．that

    C．where                          D．which

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