Follow the directions on the bottle carefully when .
A. you will take the medicine
B. taking the medicine
C. to take the medicine
D. taken the medicine
网友回答
A. you will take the medicine
(答案→)B. taking the medicine
C. to take the medicine
D. taken the medicine
解析：前面是祈使句，后面的taking 这个动作由省略了的主语发出来。