问题补充：
Who the fight against the H1N1 flu it not been for the Chinese scientists’ great efforts?
A. could have won; had
B. would win; had
C. would have won; has
D. could win; has
答案：
(答案→)A. could have won; had
B. would win; had
C. would have won; has
D. could win; has
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