阿摩線上測驗
20.The ________ of the two rivers created a massive whirlpool that was dangerous for even the most experienced boaters to navigate.
(A) divergence
(B) attrition
(C) confluence
(D) dissipation
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統計： A(7), B(0), C(12), D(1), E(0) #3861297
統計： A(7), B(0), C(12), D(1), E(0) #3861297
