問題詳情

35 The butterfly effect is the idea that a butterfly __________ its wings on one side of the world could cause a hurricaneon the other side.
(A)flap
(B)flapped
(C)flapping
(D)is flapping

參考答案

答案：C
難度：適中0.571429
統計：A(3),B(6),C(16),D(1),E(0)