問題詳情

19. Because of its high protein content, the soybean ________ a dietary staple in many places.
(A) that is
(B)have been
(C)which have
(D)has become

參考答案

答案:D
難度:簡單0.716332
統計:A(13),B(49),C(37),D(250),E(0)

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