4. The recent cooking oil scandals have led to calls for tougher ______ of sales of food products.
(A) tolerance
(B) guarantee
(C) regulation
(D) distribution
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統計: A(42), B(85), C(149), D(52), E(0) #2852460
統計: A(42), B(85), C(149), D(52), E(0) #2852460