When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.
A.broke off | B.broke down | C.broke out | D.broke away |
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When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.
A.broke off | B.broke down | C.broke out | D.broke away |