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☆精典题例☆ 1. Generally speaking, ____ according to the directions, the drug has no side effect. (2003年上海) A. when taking B. when taken C. when to take D. when to be taken 【解析】选B take和drug是动宾关系，要用过去分词作状语。可看作是when it is taken的省略。 2. Unless ____ to speak，you should remain silent at the conference. (2003年春季上海) A. invited B. inviting C. being invited D. having invited 【解析】选A you与invite是动宾关系，要用过去分 词invited作状语。 3. The research is so designed that once ____ nothing can be done to change it. (NMET 2002) A. begins B. having begun C. beginning D. begun 【解析】选D once begun 在句中作状语;once这里是连词，“一旦”。 4. ____ with the size of the whole earth, the biggest ocean does not seem big at all. (2004年 湖北) A. Compare B. When comparing C. Comparing D. When compared 【解析】选D 相当于when it is compared。 5. ____ snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest. (2004年 上海) A. Not only they brought B. Not only did they bring C. Not only brought they D. Not only they did bring 【解析】选B not only...but also引导的并列句;以not only开头的句子要部分倒装。 6. ____, he used to helped his father on the farm. A. When was a boy B. As he was a boy C. As a boy D. During a boy 【解析】选C as在这里是连词;as a boy = when (he was) a boy。 (责任编辑：admin) |