阿摩線上測驗
28. African swine fever is a highly contagious hemorrhagic disease of pigs, and almost 1 million pigs ________ over the past six months as China battles the disease.
(A) slaughtered .
(B) were slaughtered
(C) have slaughtered
(D) have been slaughtered
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統計： A(15), B(96), C(32), D(285), E(0) #2310665
統計： A(15), B(96), C(32), D(285), E(0) #2310665
