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The US president Obama said his country will sign a peace treaty with the DPRK (朝鮮) _____ the latter gets rid of all its nuclear facilities.

A. while
B. even if
C. so that
D. provided
D
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科目：高中英語(yǔ) 來源：0128 模擬題 題型：單選題

The US president Obama said his country will sign a peace treaty with the DPRK (朝鮮) _____ the latter gets rid of all its nuclear facilities.
[     ]
A. while
B. even if
C. so that
D. provided

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