the plan they are all looking forward to_____very nice 为什么用proved不用proving
问题描述：
the plan they are all looking forward to_____very nice 为什么用proved不用proving
答
因为这个句子主干是the plan____very nice,其余部分作定语从句,而而the plan应该是"被证明"为very nice故用过去分词表被动...不知楼主明白否?