Question

______ before we leave the day after tomorrow, we should have a wonderful dinner party.

A. Had they arrived B. Would they arrive
C. Were they arriving D. Were they to arrive
这里为什么选D ?　我觉得A挺合适的啊？为什么

Answer 1

leave和should have这两个动作以及the day after tomorrow这个时间都告诉我们，这是还未发生的事。要用一般将来时的虚拟语气：were to do sth.
A项是一般过去时的虚拟语气。

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Answer 2

这里是虚拟语气，should+have done表示对过去的假设，所以要选D

Answer 3

虚拟语气 的 用法 ，如果选A 的话 表示的事情是过去了的。所以选D