摘要： 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
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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
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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 |