题目内容
18.EBOLA(埃博拉)is said_______ another big health challenge to humans over the past several months.( )A. | becoming | B. | to become | C. | having become | D. | to have become |
分析 句意:据说在过去几个月期间,埃博拉对人类来说已经成了另一个大的健康挑战.
解答 答案:D.根据be said to do sth.意思是:据说要干某事.所以排除A,C.再根据句末的时间状语over the past several months,故这里的不定式用完成式,表示已经成为.
点评 此题考查非谓语动词中的不定式的完成式的用法,同学们应该把握好以下的知识:to do 表目的、将来;doing 表主动、伴随;done表被动、完成.同时答题步骤为:1.判断是否为非谓语动词,看是否有连词.2.找逻辑主语.3.判断逻辑主语与非谓语动词的关系.4.看是否非谓语动词动作发生在主句谓语动作之前,如果是之前,就用完成式的形式.
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