___itcarefullycanwehopetofindawaytosolvethechallengingp... 國語站 題庫 1.85W 大中小設置文字大小 問題詳情:___ it carefully can we hope to find a way to solve the challenging problem.A.When we observe B.When to observe C.That we should only observe D.Only by observing【回答】D知識點:倒裝與省略題型:選擇題 TAG標籤:#