阿摩線上測驗
17. The radio waves have offered the means ____ the universe has been determined 20 billion years
of age.
(A) by which
(B) as those
(C) for what
(D) all that
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統計： A(344), B(16), C(76), D(16), E(0) #2002641
統計： A(344), B(16), C(76), D(16), E(0) #2002641
