問題詳情

【題組】16.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

參考答案

答案：D
難度：適中0.5
統計：A(2),B(1),C(0),D(4),E(0)

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【joanne1994042】評論

remain+adj未被解答