help!I __ with you because I was in London at the time.A couldn't go B couldn't have gone C shouldn't have gone D needn't have gone

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help!I __ with you because I was in London at the time.
A couldn't go B couldn't have gone C shouldn't have gone D needn't have gone

A,我觉得couldn't go 代表的是虚拟,.和一般过去时相对应.整句话"我不能跟你走,因为我那时在伦敦"说明"go with you"是在"was in London" 之后的动作.

B