were to have
had had
were having
had
本题考查过去将来时。根据ten years ago可知是过去发生的事情， 根据could have imagined...that...可知，应该是他们没想到未来电视会有那么大的市场份额，所以是对于过去来说的将来时。故选A。
句意：我们的电视卖得很好，但是十年之前没有人能够想象它们会有这么大的市场份额。
