The doctor did everything they could        the dying boy’s life, but they failed.
A．saving               B．to save              C．saved
B

試題分析：句意:醫(yī)生做所有他們能做的事來(lái)救這個(gè)即將死去的孩子的生命，但是他們失敗了。在這句話中they could 是一個(gè)定語(yǔ)從句，修飾先行詞everything。從句中省略了動(dòng)詞do；動(dòng)詞不定式在這里做目的狀語(yǔ)，表示為了…。故選B。
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