15. Historians are still mystified by the question _____ some ancient civilizations disappeared suddenly in
history.
(A) that
(B) how
(C) is how
(D) that is
詳解 (共 2 筆)
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that 作連接詞時是可以引導名詞子句，...
未解鎖
這道題目考查的是名詞子句作為同位語或受...
私人筆記 (共 1 筆)
未解鎖
Historians are sti...
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