题目内容
19.It's bad for your eyes if you keep them ______ on the screen for a long time.( )A. | fixed | B. | fix | C. | fixing | D. | having fixed |
分析 你如果眼睛长时间盯着屏幕会对眼睛有害的.
解答 答案:A 句中fix作keep的宾语补足语,fix与them之间构成动宾关系,要用表示被动的过去分词.故选A.
点评 过去分词是非谓语动词的一种,用法很灵活,分为简单式done(表示与谓语同时或几乎同时发生的动作);完成式having been done(表示先于谓语的动作).学习时,要把握其用法特征:表示被动和完成.同时还要注意区分现在分词和不定式.

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