271. Even though a lot of research has been conducted to unveil the mystery, whether there are aliens out there____ unanswered.
(A) exists
(B) ponders
(C) features
(D) remains

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統計： A(15), B(6), C(10), D(25), E(0) #1592481

詳解 (共 2 筆)

#2330616
Even though a lot of...
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 ponders 幾點思考；(vt.)仔細考慮，衡量；(vi.)考慮，沉思

(C) features 特徵

remains 遺跡；(n.)殘餘，遺骸

Even though a lot of research has been conducted to unveil the mystery, whether there are aliens out there remains unanswered. 即使已經進行了大量的研究以揭示這個謎團，是否有外星人這問題還是沒有答案。

unveil

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