33 [单选题] He must have had an accident, or he ( ) thenA. would have been hereB. would be hereC. should be hereD. had just had

本题考查虚拟语气在含蓄条件句中的用法。关键点在于：

1. 前半句"He must have had an accident"是对过去的推测，隐含"if he hadn't had an accident"的条件；
2. or连接的从句表示与过去事实相反的假设，需用would have + 过去分词结构；
3. 时间标志词then进一步确认需用完成时形式。

选项分析

A. would have been here

• 正确。符合虚拟语气中与过去事实相反的假设结构（would have + 过去分词），且与then的时间指向一致。

B. would be here

• 错误。would be表示与现在事实相反，但then指向过去，时态不符。

C. should be here

• 错误。should表示推测或义务，但此处需要虚拟语气，且时态不匹配。

D. had just had

• 错误。过去完成时表示已完成的动作，但此处需表达假设性结果，而非事实。