問題詳情
46. Ever since the first nuclear power stations were built, doubts have _____ about their safety.
(A) preserved
(B) traces
(C) tracks
(D) trails
(A) preserved
(B) traces
(C) tracks
(D) trails
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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