Question

Taking this kind of medicine, if _________, will surely produce side effect．

1. A.
   continue
2. B.
   having continued
3. C.
   continuing
4. D.
   continued

Answer 1

D
此题考查的是对插入语的正确理解，if continued＝if it is continued。if continued是一插入语，Taking this kind of medicine是句子的主语，will produce为谓语。句子意思是：服用这种药物，如果持续不断的话，一定会产生副作用。故答案选择D项。