问题补充：
单选题Weshouldn havecomenorthforChristmasvacation.Ifwe_______,wewouldn bestuckinthesnowrightnow.A.wasn B.didn C.hadn D.weren
答案：
C解析考查虚拟语气。根据We shouldn have come north for Christmas vacation（我们本不应该来北部过圣诞假期）可知，If we ——是对过去的虚拟，故选择C。完整的句子应当是If we hadn come north for Christmas vacation.
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