Anyone , once positive for H7N9 flu virus , will receive medical treatment from our government.
A. to be tested
B. being tested
C. tested
D. to test
网友回答
A. to be tested
B. being tested
(答案→)C. tested
D. to test
解析：句意为：一旦被检测出感染了H7N9流感病毒，任何人都要从我们的政府那里接受医学治疗。从once条件状从的角度，此题可以考虑为是在考查省略，省略的条件为非谓语动词的逻辑主话与句子的主语（everyone）一致，且有系动词be,这时可省去主语和be动词，补充完整为:Anyone, once (anyone is ) tested
Positive for H7N9 flu virus, will receive medical treatment from our government. 故答案为C。也可从非谓语动词作状语的角度考虑，anyone与test之间的关系为被动，故应排除D，A表示将来的被动，B表示正在进行的被动，均不符合题意。