36. Analysts estimate sales could reach $300 million a year once regulatory ______ are cleared and full marketing gets under way.
(A) hurdles
(B) pillars
(C) rebates
(D) esteems
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統計: A(6), B(0), C(7), D(6), E(0) #4003043
統計: A(6), B(0), C(7), D(6), E(0) #4003043