问题
选择题
The A(H1N1) flu virus will infect a third of the world's Population ____ it continues to spread at this rate,
some scientists warned. [ ]
A. when
B. if
C. though
D. as
答案
答案：B
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The A(H1N1) flu virus will infect a third of the world's Population ____ it continues to spread at this rate,
some scientists warned. [ ]
A. when
B. if
C. though
D. as
答案：B