Doctors study for six years after ___schoolA.finishB.finishesC.finishingD.is finishing

问题描述:

Doctors study for six years after ___school
A.finish
B.finishes
C.finishing
D.is finishing

c.After doing sth.

finish school是固定用法,但属于动词,而after后只跟名词/动名词,所以选C

C.finishing
after doing sth在做完什么事之后
after 后要跟动词ing形式

C after后面只能加这个了