747. Sickness is rampant in this area; its _____ has always been a worry for many foreign investors.
(A) prescription
(B) misery
(C) sanitation
(D) pharmacy
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統計: A(16), B(14), C(48), D(15), E(0) #1592957
統計: A(16), B(14), C(48), D(15), E(0) #1592957