Students should do everything they can ___their study.A.improve B.to improve C.improving D.improved

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Students should do everything they can ___their study.A.improve B.to improve C.improving D.improved

Students should do everything they can ___their study.A.improve B.to improve C.improving D.improved
Students should do everything they can ___their study.
A.improve B.to improve C.improving D.improved

Students should do everything they can ___their study.A.improve B.to improve C.improving D.improved
选B,这里they can是修饰everything的,充当everything的后置定语从句,to improve表目的.句子简化后是Students should do everything to improve their study.
学生应该尽最大努力去提高学习

B,不定式引导的状语从句。

选B 因为 they can 是用来修饰everything的,把这个修饰词去掉,这个提会很明了~