問題詳情

40 Over millions of years, birds such as ostriches, emus and penguins have _____ lost the ability to fly.
(A)gradually
(B)properly
(C) suddenly
(D) temporarily 

參考答案

答案:A
難度:適中0.685789
統計:A(1052),B(224),C(104),D(154),E(0)

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