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之間為被動關(guān)系，該使用被動語態(tài)，排除CD項，B項為過去完成時的被動語態(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．

點評 對于句子的時態(tài)題要分清句子發(fā)生的具體時間，以及句子的主語與動詞之間的邏輯關(guān)系．We won't start the work until all the preparations have been made．直到所有的準備工作都做好以后，我們才開始工作．

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