問題詳情
No one knows how the fire broke out. The police have started an ______ into the cause of it.
(A) appreciation
(B) extension
(C) operation
(D) investigation
(A) appreciation
(B) extension
(C) operation
(D) investigation
參考答案
答案：D
難度：簡單0.761261
統計：A(11),B(15),C(17),D(169),E(0)
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