【題目】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】

考查表語(yǔ)從句。本句中what引導(dǎo)表語(yǔ)從句，并在句中做主語(yǔ)。句意：既有更好的工作也有更多的自我提升的機(jī)會(huì)是海外高技術(shù)人才回歸國(guó)內(nèi)背后的原因所在。ABD三項(xiàng)都是連接副詞，要在句中作狀語(yǔ)，不能做主語(yǔ)。故C項(xiàng)正確。

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