What caused the accident and who was responsible for it_____a mystery to us.
问题描述：
What caused the accident and who was responsible for it_____a mystery to us.
为什么选B而不选A?
答
答案是remains 吗谁造成事故和谁应该对它负责对我们仍然是个谜.不及物动词 vi.[W]1.剩下,余留A few pears remain on the trees.树上尚留有几颗梨子.2.继续存在Little of the original architecture remains.原先的建...