問題詳情
29. The first use of atomic weapons was in 1945. and their power ______ increased enormously ever since.
(A). is
(B). was
(C). has been
(D). had been
(A). is
(B). was
(C). has been
(D). had been
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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