分类：教育/科学-外语学习
问题：高一英语选择题Generallyspeaking,_______ 
Generally eaking, _________ according to the direction,the drug has no side-effect.A.when taking B. when taken C. when to take D. when to be taken请教选与不选的原因.谢谢!
回答：B when taken = when the drug is taken