問題詳情

17. The radio waves have offered the means ____ the universe has been determined 20 billion yearsof age.
(A) by which
(B) as those
(C) for what
(D) all that

參考答案

答案：A
難度：困難0.333333
統計：A(1),B(0),C(0),D(2),E(0)