单选题 All their attempts to ______ the child from the burning building were in vain.

【正确答案】 C
【答案解析】本题考查动词辨析。rescue sb. from sth.“从…当中援救…”，固定搭配；regain“收回，恢复”；recover from...“从…当中恢复”；reserve“保存，保留，预定”。句意为：他们从着火的大楼里援救这个孩子的所有努力全都白费了。