指考詞彙考古題

全民英檢 | 學測/指考 | 國中會考

高中英文參考詞彙 第1級第2級第3級第4級第5級第6級

No one knows how the fire broke out. The police have started an      into the cause of it.

(A) extension
(B) appreciation
(C) investigation
(D) operation