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___itcarefullycanwehopetofindawaytosolvethechallengingp...

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问题详情:

___itcarefullycanwehopetofindawaytosolvethechallengingp...

___ 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

知识点:倒装与省略

题型:选择题

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