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    【题目】The mixture of better jobs and greater chances of self-promotion is _____ lies behind the return of oversea Chinese high-tech talents.

    A. why B. where

    C. what D. when

    【答案】C

    【解析】

    考查表语从句。本句中what引导表语从句，并在句中做主语。句意：既有更好的工作也有更多的自我提升的机会是海外高技术人才回归国内背后的原因所在。ABD三项都是连接副词，要在句中作状语，不能做主语。故C项正确。

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