2.The project they had devoted up to two years towas chosen(choose) as the best one at the conference.

分析 他們已經(jīng)投入了長達兩年之久的項目,在這次大會上被選為最好的一個.

解答 答案:was chosen.首先要知道"they had devoted up to two years to"這部分是一個定語從句,主語是The project,也就是說空格處需要用choose的某種形式來做句子的謂語.根據(jù)"had devoted"可知是在這次大會之前的動作,所以主句要用一般過去時,另外對于The project來說,是被選出來的,主語project是動詞choose的動作承受者,所以要用一般過去時的被動語態(tài),其形式為was/were+及物動詞的過去分詞.主語為單數(shù)project,故填was chosen.

點評 首先要能熟練分析句子成分,然后找出句子的主語以及謂語動詞,再根據(jù)句子提供的信息,確定要使用的時態(tài)和語態(tài),最后確定正確答案.

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