問題詳情
Since the 1930s, hundreds of stone balls have been found in Costa Rica. It’s believed that they ______ by the ancestors of native peoples who lived there at the time of the Spanish conquest.
(A)could have been made
(B)have been making
(C)could make
(D)being made
(A)could have been made
(B)have been making
(C)could make
(D)being made
參考答案
答案：A
難度：適中0.592335
統計：A(170),B(47),C(27),D(15),E(0) #
個人：尚未作答書單：make up one's mind 下決心、文法、拔出
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