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【題目】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】

考查非謂語動詞。句意：醫(yī)生盡其所能的（目的是）去救那個男孩，但徒勞無益。表目的，一般用動詞不定式表示，故選B項。

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