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it carefully can we hope to find a way to solve the challenging problemA．When we

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it carefully can we hope to find a way to solve the challenging problemA．When we

___ 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

试题答案

D

标签：findtowaythesolve

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