问题
选择题
_______, follow the directiom on the bottle carefully.
A．Takes medicine
B．To take medicine
C．When one takes medicine
D．When taking medicine
答案
答案：D
本题考查非谓语动词。句中follow the direction on the bottle carefully.为祈使句，省略主语you，故逻辑主语与take之间为主动关系，故用现在分词。句意：当服药的时候，仔细遵照瓶子上的说明。