[題目] 請問這題的文法選擇?
請問一下這題的文法選擇要怎麼選?
是用到哪種文法?
Under the circumstances it still remains ________ whether the OPEC will agree
to increase the output of petroleum.
(A) to see
(B) seeing
(C) seen
(D) to be seen
麻煩幫小弟解惑一下
謝謝!
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