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Researchers have been determined to ______ how bird flu spreads from human to human worldwide.
A.turn outB.figure out
C.pick outD.check out
2017高二·全国·课时练习
知识点:figure outpick outturn out动词词义辨析 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!