阿摩線上測驗
19. Frost occurs in valleys and on low grounds_______ on adjacent hills that might create danger for drivers on the road.
(A) more frequently than
(B) too frequent
(C) so frequent that
(D) as frequent as
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統計： A(67), B(5), C(7), D(25), E(0) #2849418
統計： A(67), B(5), C(7), D(25), E(0) #2849418
