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、D

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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

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科目：高中英語(yǔ) 來(lái)源： 題型：單選題

________ it carefully can we hope to find a way to solve the challenging problem．


  1. A.
    When we observe
  2. B.
    When to observe
  3. C.
    That we should only observe
  4. D.
    Only by observing

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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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