Those experienced doctors in our country the meeting in order to find out the real of bird

问题补充：

Those experienced doctors in our country the meeting in order to find out the real of bird flu(禽流感).

A. attended; cause

B. joined; reason

C. joined; cause

D. attended; reason

答案：

(答案→)A. attended; cause

B. joined; reason

C. joined; cause

D. attended; reason

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