问题
选择题
13. The struggle against the bird flu and the suffering _________ brought about have become a big concern across the world.
A．which has
B．it is
C．it has
D．what is
答案
C
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13. The struggle against the bird flu and the suffering _________ brought about have become a big concern across the world.
A．which has
B．it is
C．it has
D．what is
C