______ before we depart the day after tomorrow we should have a wonderful gather-together

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______ before we depart the day after tomorrow, we should have a wonderful gather-together.

A.Had they arrived

B.Would they arrive

C.Were they arriving

D.Were they to arrive

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。