WemustdoeverythingwecanwasterwaterfromrunningintoA.keep;riversB.kept;riversC.tokeep;riversD.keeping;rivers

Question

We must do everything we can _ waster water from running into _
A.keep;rivers B.kept;rivers C.to keep;rivers D.keeping;rivers

Answer 1

选C这个题很考人的.首先要分清楚句子的结构,其中we can是省略了do的,那么we can do就是一个省略了that的定语从句,原来应该是everything that we can do,然后to keep做的是目的状语,所以用了不定式,不要看是在can后面就一定是动词原形,关键是理清句子的结构.