The doctors and the nurses did all they could ______ the patient’s life.

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问题 The doctors and the nurses did all they could ______ the patient’s life.

选项 A、save
B、to save
C、to be saving
D、to have saved

答案B

解析本题考查不定式的用法。句中they could是定语从句修饰all，因此to save one’s life是医生和护士努力的目的。

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