can是情态动词 但是为什么We should do everything we can 后面从句can单独使用?

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• ①Who jumps highest in your class?—john ____.A.has done B.did C.does D.do我认为是选B 可答案是选C、 可跳高不已经是过去式了吗?②Today the forests have almost gone.People must____down too many tress .A.stop on cutB.stop from cuttingC.be stop to cut D.be stop from cuttingC③We must do everything we can ____ waste water from running intorivers.A.keep B.kept C.to keep D.keeping can 不是情态动词吗?后面难道不是接原型吗?④ She counldn't __ her words ___by the students.A.get understand B.get understood C
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• can是情态动词 但是为什么We should do everything we can 后面从句can单独使用?
• We should do as much as we can ___ water. A.for saving B.to save C.save D.tsavedWe should do as much as we can ___ water. A.for saving B.to save C.save D.tsaved答案给的是B,但我想知道C为什么不对,can不是情态动词吗,既然是后面为什么还要先加to再加动词.还有就是The man ran out ___（see） what was wrong.为什么要填to see？这里有什么语法讲究吗？谢谢。
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• can是情态动词 但是为什么We should do everything we can 后面从句can单独使用?
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