1．The report aims to explain how these conclusions ______．（　�。�
A．were reachedB．had been reached
C．have reachedD．had reached

分析 這篇報(bào)告旨在于解釋這些結(jié)論是如何做出來的．

解答 答案：A
本句實(shí)際考查的是固定搭配reach the conclusion得出結(jié)論．根據(jù)句意"這些結(jié)論是如何做出來的"可知conclusions與reach之間為被動(dòng)關(guān)系，該使用被動(dòng)語(yǔ)態(tài)，排除CD項(xiàng)，B項(xiàng)為過去完成時(shí)的被動(dòng)語(yǔ)態(tài)，在上下文中沒有出現(xiàn)過去的過去的含義．而得出結(jié)論是已經(jīng)發(fā)生的事情，故A正確．

點(diǎn)評(píng) 對(duì)于句子的時(shí)態(tài)題要分清句子發(fā)生的具體時(shí)間，以及句子的主語(yǔ)與動(dòng)詞之間的邏輯關(guān)系．We won't start the work until all the preparations have been made．直到所有的準(zhǔn)備工作都做好以后，我們才開始工作．

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