20、___ 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
20、C
科目：高中英語(yǔ) 來(lái)源： 題型：
___ 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
科目：高中英語(yǔ) 來(lái)源： 題型：單選題
科目：高中英語(yǔ) 來(lái)源：2008年寧夏銀川一中高三年級(jí)第三次模擬考試、英語(yǔ)試卷 題型：014
________ 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
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