All possible means       to save the wounded soldier.
A．has been triedB．have been tried
C．is to be triedD．a(chǎn)re trying
B
means是單復(fù)數(shù)同形名詞，謂語的單復(fù)數(shù)取決于句子意思，如all/those/a lot of means動(dòng)詞用復(fù)數(shù)；every/this/that means動(dòng)詞用單數(shù)。
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