___________,follow the directions on the bottle carefully
题目
___________,follow the directions on the bottle carefully
A:when taken drugs
B:when drugs taken
C:when one takes drugs
D:when taking drugs
答案
选D
主语是省略了you的祈使句
主句主语you和take drug的关系是主动的关系
:when taking drugs=when you take drugs
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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