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单选题
51.If theybefore we leave tomorrow, we should invite all our friends to hold a party to welcomethem.
A
A. had come back
B
B. were coming back
C
C. were to come back
D
D. would come back
答案解析
正确答案：C
解析：
51.【翻译】要是明天他们在我们离开之前回来，我们就邀请所有的朋友来办个派对欢迎他们。【精析】C分析句子结构可知，本句包含一个If引导的非真实条件句。根据从句中的时间状语tomorrow和主句谓 语动词should invite可知，本句是对将来情况的假设，所以从句的谓语动词应用过去式（be动词用were ）或*＇ should/ were to +动词原形”的形式。故选C。
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