[題目] 題目不懂
書名：2011~2012 新TOEIC閱讀題庫
頁數：P11 第113題
題目：The research and development team have ____ to find an inexpensive means
to solve that problem
(A) already
(B) so
(C) since
(D) yet
答案是(D)
為什麼選(A)不行?
解答上寫: have yet to + V
請問這是既定用法嗎?
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