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【题目】The doctor did what he could _______ the boy, but in vain.

A. save B. to save

C. saving D. saved

【答案】B

【解析】

考查非谓语动词。句意:医生尽其所能的(目的是)去救那个男孩,但徒劳无益。表目的,一般用动词不定式表示,故选B项。

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