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  3. ______ before we leave tomorrow, we should invite all our friends to hold a party to welcome them.

______ before we leave tomorrow, we should invite all our friends to hold a party to welcome them.

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问题 ______ before we leave tomorrow, we should invite all our friends to hold a party to welcome them.
选项 A、Had they come back
B、Were they coming back
C、Were they to come back
D、Would they come back
答案C
解析 根据句中的时间状语tomorrow和should invite可知，从句是对将来情况的假设。在表示对将来情况假设的非真实条件句中，从句的谓语动词用过去式(be动词用were)或“should／were to+动词原形”的形式。当if引导的非真实条件句中含有were，had或should时，可省略if，并将were，had或should放在主语前面，形成倒装。故选C。
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