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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”。

在高中复习阶段，大家一定要多练习题，掌握考题的规律，掌握常考的知识，这样有助于提高大家的分数。精品学习网为大家整理了2014英语高一必修一知识点，供大家参考。