Students should do everything they can __their study.A.improve B.to improve C.improving D.improved不太明白.别人给我讲说,如 he did what he can to help the poor(他尽其所能帮助穷人,what he can宾语从句,后面的to do 是目的状语.请问can后面的动词do呢?
问题描述：
Students should do everything they can __their study.A.improve B.to improve C.improving D.improved
不太明白.别人给我讲说,如 he did what he can to help the poor(他尽其所能帮助穷人,what he can宾语从句,后面的to do 是目的状语.请问can后面的动词do呢?
答
they can 作everything的定语从句，相当于修饰它，并且they can 后面省略了do，该句的意思是学生应该做任何他们能做的事来提高他们的学习成绩，所以后面的是目的状语从句，不定式表目的，所以选B
答
can 后面的动词就是前面的那个do
本来应该是student should do everything they can do to improve…，为避免重复，后面那个do就省掉了！
to improve是目的状语！
答
句子结构是：Students ——主语；（should do everything ）（they can）——动宾+定语,意思是：任何他们能做到的事；to improve their study——目的状语,意思是：以提高他们的成绩.“they can”修饰的是everything...
答
Students should do everything （they can） to improve their study.
they can 可以看作是插入语，其实是定语，can后面的动词do 与前面的do重复，故省略了。