阿摩線上測驗
35 The butterfly effect is the idea that a butterfly __________ its wings on one side of the world could cause a hurricane
on the other side.
(A)flap
(B)flapped
(C)flapping
(D)is flapping
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統計： A(7), B(23), C(133), D(18), E(0) #1043766
統計： A(7), B(23), C(133), D(18), E(0) #1043766
