Students should do everything they can __their study.A.impro

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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?

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,做定语
所以to do不是接在can后面,而是接在everything 后面的~去掉修饰的定语就好理解了：
Students should do everything to improve their study.
如有帮助请采纳~O(∩_∩)O~

Students should do everything they can __their study.A.impro Students should do everything they can ___their study. they should always do everything well 改成被动语态 what should the students not do when they take a test? We should do everything we can (orotect) the environment. We should do everything we can ________ people pollution the everyone should do everything ()can to pritect the environme We students should do what we can （C） our country.A.serve B. Some students can't decide which dicitionary they should cho A boy can do everything for :A boy can do everything for a boy can do everything for girl.