Generally speaking, _______ according to the directions, the drug has no side effect. A. when taking B. when taken C. when to take D. when to be taken 答案:解析:选B。考查状语从句的省略。when taken是when the drug is taken的省略。They believe that there is __________ in the world. A. no such a car B. no such car C. not such cars D. not such car