26. The news that scientists so far haven’t found out the cause of bird flu discouraged so

发布时间：2020-08-15 03:07:38


26. The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials,    ?  
A. didn’t they
B. did it
C. didn’t it
D. did they

网友回答

A. didn’t they
B. did it
(答案→)C. didn’t it
D. did they
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