What caused the accident and who was responsible for it_____a mystery to us.为什么选B而不选A?

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What caused the accident and who was responsible for it_____a mystery to us.为什么选B而不选A?

What caused the accident and who was responsible for it_____a mystery to us.为什么选B而不选A?
What caused the accident and who was responsible for it_____a mystery to us.
为什么选B而不选A?

What caused the accident and who was responsible for it_____a mystery to us.为什么选B而不选A?
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.
原先的建筑物几乎没有残留.
3.(人)留下;逗留
She remained in her office all afternoon.
她整个下午没有离开办公室.
4.保持,仍是[L]
This room remains cool all summer.
这个房间整个夏天保持凉爽.
She remained silent all night.
她整个晚上沉默不语.
5.留待,尚待[+to-v]
Several problems remain to be solved.
有好几个问题尚待解决.
6.属于,归属[(+with)]
The decision remains with the general manager.
还得由总经理作决定.

AB都啥答案啊?

was

哪里有AB这两个答案啊?我怎么看不见?你应该写清楚哪个是A,哪个是B