阿摩線上測驗
15. With the outbreak of H7N9, how to control this easily spreading disease has become a major _____ in mainland China.
(A) destruction
(B) bargain
(C) concern
(D) assistance
(E) attack
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統計： A(51), B(20), C(246), D(18), E(12) #1961036
統計： A(51), B(20), C(246), D(18), E(12) #1961036