I'd go with you to the trip ,but I ___no time.本题出自何处
此题的第一种语境应该是：If I had time now,(与现在的事实不相符的虚拟条件句)I would go with you,but I have no time now(现在的真实情况)，所以，我认为还是应该选择have.
第二种语境应该是if I had had time then,(与过去事实不相符的虚拟条件句)I would have gone with you on the trip,but I had no time then.（过去的事实）答案选择had.
我可以认同I'd是I would 的缩写 would是will的过去式
此举的意思是：当时我愿意和你一起去旅游，但是我没有时间。是指当时没有时间，不是现在。所以应该用had 但是上面两种理解都有可能吧！