问题
选择题
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
答案
答案：C
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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
答案：C