【題目】Every possible means __________ to save the wounded soldier up to now.

A. was tried B. were tried

C. have been tried D. has been tried

【答案】D

【解析】句意:到目前為止，為救傷員各種可能的方法都已經(jīng)用上了。means方法，手段，單復(fù)數(shù)相同，every means為單數(shù)，謂語動詞用單數(shù)；另外，up to now迄今為止，用于現(xiàn)在完成時(shí)

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