18. For over a decade, U.S. military and counterterrorism officials have warned that Africa was poised
to become the next frontier _____ international terrorist organizations.
(A) out
(B) for
(C) on
(D) at
詳解 (共 4 筆)
未解鎖
翻譯 : 十多年來，美國軍方和反恐官員一...
未解鎖
跟frontier沒關係喔 同樣結構, ...
未解鎖
frontier for(邊界) .....
未解鎖
來自紐約時報 https://www.n...
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