according to the instructions the medicine I think will work on your headache before

问题补充：

, according to the instructions, the medicine, I think, will work on your headache before long.

A. Take

B. Being taking

C. Taken

D. Taking

答案：

A. Take

B. Being taking

C. Taken

(答案→)D. Taking

解析：考查非谓语动词。Take与句子主语I 为主谓关系用现在分词作状语。句意：按照说明书服药我想不久就会对你的头疼有作用了。