According an official from WHO,it will take a long time for the swine flu shot__________.A.to produceB.to be producedC.to have producedD.to be producing

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According an official from WHO,it will take a long time for the swine flu shot__________.
A.to produceB.to be producedC.to have producedD.to be producing

B,首先这是一个被动句,猪流感被爆发,所以用被动式.其次,take a long time to do 是固定用法.

B
it takes 时间/金钱(for sb)to do sth; 而swine flu shot是被生产制作的,故采用被动式,所以答案为B

B