___you understand the role,you will have no further difficuly.A.Once B.Unless为什么不选A

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___you understand the role,you will have no further difficuly.A.Once B.Unless为什么不选A
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___you understand the role,you will have no further difficuly.A.Once B.Unless为什么不选A
___you understand the role,you will have no further difficuly.
A.Once B.Unless
为什么不选A

___you understand the role,you will have no further difficuly.A.Once B.Unless为什么不选A
Once是 曾经 的意思 unless相当于 If not