题目内容
9．We must do everything we can ____ waste water from running into rivers．（ ）| A． | to keep | B． | kept | C． | keep | D． | keeping |
分析 我们必须尽我们所能的来阻止废水流入江河之中．
解答 答案：A．根据We must do everything we can ____ waste water from running into rivers，可知本句中的we can是一个前面省略了关系代词that，后面省略了do的定语从句，修饰先行词everything，不定式to keep…from 作do everything的目的状语．故选A．
点评 本题考查了动词不定式的用法．解答时注意理解句意以及所给选项的意思并作出正确选择．
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