Although not too many people _________ A/H1N1 in the world so far，we had better not go to the crowds．

A．caught                           B．has caught

C．have caught                       D．have been caught

1、C

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Although not too many people _________ A/H1N1 in the world so far，we had better not go to the crowds．

A．caught                           B．has caught

C．have caught                       D．have been caught

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