After the earthquake on May 12,many soldiers went out there to save people_____losing there lives.a.at the cost of b.a number of c.a great deal of d.disappointing e.by the time f.every time

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After the earthquake on May 12,many soldiers went out there to save people_____losing there lives.
a.at the cost of b.a number of c.a great deal of d.disappointing
e.by the time f.every time

如果没有你的问题补充,可以按照楼上回答的来,用from,意思是,512地震后,很多战士赶赴区拯救更多的生命.
但是你加了问题补充,成了选择题了,那就只有选择 A,at the cost of,意思就成了,512地震后,很多战士冒着生命危险赶赴灾区去救人.

from
补充:
save
及物动词 vt.
救,挽救[(+from)]
He saved me from drowning.
他救了我,使我免遭溺死。