10．當(dāng)被問及為何投入這個研究時，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，這是敘述的過去的事實(shí)，所以使用一般過去時．
本句可使用when引導(dǎo)的時間狀語從句，或者使用狀語從句的省略結(jié)構(gòu)，即把狀語從句中的主語和be動詞省略；同時使用why引導(dǎo)的從句作動詞asked的賓語．keep silence保持沉默．

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

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