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The two countries used to be war with each other, but now they are peace. [ ]A.a

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The two countries used to be war with each other, but now they are peace. [ ]A.a

The two countries used to be ________ war with each other, but now they are ________ peace.[     ]A.at; in  
B.in; at
C.at; at  
D.in; in

试题答案

C