题目内容
18.An expert team ______ to study H7N9bird flu virus in April,2013.( )| A. | is set up | B. | was set up | C. | has set up |
分析 2013年4月成立了一个专家小组研究H7N9禽流感病毒.
解答 答案:B.
首先语境推测句意是"2013年4月成立了一个专家小组研究H7N9禽流感病毒.",由于句子表述的是发生在过去的事情,判断句子中的谓语动词用一般过去时,主语An expert team 是动作set up的承受者,所以用被动语态,一般过去时被动语态的构成是:主语+was/were+动词的过去分词,故选B.
点评 本题考查时态和语态.每个时态都有标志词,熟记这些标志词是做题的关键.在没有时间状语的情况下可以根据语境来对时态做出判断.判断语态的关键则是观察主语是谓语动词的执行者还是承受者.
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