题目内容
20.Bears have been observed __________ by bees.( )A. | to attack | B. | attacked | C. | attacking | D. | attack |
分析 熊被观察到遭到蜜蜂的攻击.
解答 答案是B.本题考查分词做主语补足语.动词observe 后接非谓语动词做宾语补足语常见的三种形式:1)不带to 的动词不定式,即observe sb.do表示"观察某人做某事(全过程)",其被动语态要补充不定式符合to,即be observed to do;2)现在分词做宾语补足语,即observe sb.doing 表示"观察某人在做某事",分词和宾语之间是主动关系;3)过去分词做宾语补足语,即observe sth.done表示"观察到某事被做";分词和宾语之间是被动关系,改成被动结构是sth./sb.be observed done,此时done充当主语补足语,分词和主语之间是被动关系;本题中bears和attack之间是被动关系,所以答案选择B.
点评 在非谓语动词的解题中要在掌握其基本用法的基础上关注并积累一些固定用法,结合具体语境做出合理的判断.

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