Teachers are always doing everything they their students.A.can helpB.can to help
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Teachers are always doing everything they ________ their students.
A.can help
B.can to help
C.help
D.to help
试题答案
B
本题选项欺骗性极强，但只要仔细分析句子结构，就能理解各选项的意思。they can为定语从句，修饰先行词everything，动词do被承前省略，不定式to help作主句的目的状语。