Every ________ had been made in order to save the boy with the H5N1 bird flu, but all in vain. He died at last.
A．effectB．a(chǎn)ffectC．infectD．effort
D
詞義辨析。A.影響  B. 情感 C.感染  D. 努力。句意：為了救助感染H5N1禽流感的男孩，付出了所有努力，但是都無(wú)濟(jì)于事。他最后死了。故選D。
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