10．當(dāng)被問(wèn)及為何投入這個(gè)研究時(shí)，他保持沉默．（involve）When （he was） asked why he was involved in the study，he kept silence （silent）．．

分析 When （he was） asked why he was involved in the study，he kept silence （silent）．

解答 When （he was） asked why he was involved in the study，he kept silence （silent）．
根據(jù)句意可知，這是敘述的過(guò)去的事實(shí)，所以使用一般過(guò)去時(shí)．
本句可使用when引導(dǎo)的時(shí)間狀語(yǔ)從句，或者使用狀語(yǔ)從句的省略結(jié)構(gòu)，即把狀語(yǔ)從句中的主語(yǔ)和be動(dòng)詞省略；同時(shí)使用why引導(dǎo)的從句作動(dòng)詞asked的賓語(yǔ)．keep silence保持沉默．

點(diǎn)評(píng) 翻譯題在解題時(shí)首先要確定好句子的時(shí)態(tài)，然后要把握好短語(yǔ)表達(dá)，最后要注意句子結(jié)構(gòu)．

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