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The importer will submit references if these ______ given in the preliminary negotiations.
A、are not
B、had not been　　
C、has not been
D、were not
【正确答案】：D
【题目解析】：句意：如果在初步谈判中没有提及，进口商将提交参考资料。if虚拟语气：与现在事实相反，从句用were，故选D。