Anyone, once positive for H7N9 flu virus, will receive free 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：考查状语从句的省略。句意：任何人，一旦被检测出H7N9呈阳性，就可以得到政府免费的医疗护理。英语中当主从句的主语一致的时候，可以省略从句的主语和be动词，所以完整的从句应该是once anyone is tested…..,这时可以省略anyone is，就剩下tested，所以选C。
【考点定位】考查状语从句的省略。