what caused the accident and who was responsible for it ( ) a mystery to us.A.remain B.remains如果是的话,为什么后面是a mystery?

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what caused the accident and who was responsible for it ( ) a mystery to us.A.remain B.remains如果是的话,为什么后面是a mystery?
what caused the accident and who was responsible for it ( ) a mystery to us.
A.remain B.remains
如果是的话,为什么后面是a mystery?

what caused the accident and who was responsible for it ( ) a mystery to us.A.remain B.remains如果是的话,为什么后面是a mystery?
动词的单复数是跟前面的主语有关的,答案是A的话,前面两件事情的肇事者显然不是同一种东西,前者是原因,后者是人,因此在这里最好不把这两件事情当作一个整体,而是当作两个事情,如果句子是Who caused the accident and was responsible for的话,选择B就好一点.这么说你可能容易接受一点,He(假设是造成事故的原因)and she(假设是需要对时间负责的人)()a mystery to us,你会选择什么?(最后关于你说的a mystery讲讲,举个例子,They make a cake
./We became(are) a team.仔细想想你说的宾语或者表语单复数对动词单复数是否有影响)

B。。。。。

答案是b

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...

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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。

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答案是remain。前面是主语从句,remain在这里作为主句的谓语,因为主语从句有两个问题,所以动词用复数。responsible for是对什么负责。整句意思是“引起事故的原因和为此负责的人对我们来说还是个谜”remain后面是表语,相当于to be,可改写为are still a mystery...

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答案是remain。前面是主语从句,remain在这里作为主句的谓语,因为主语从句有两个问题,所以动词用复数。responsible for是对什么负责。整句意思是“引起事故的原因和为此负责的人对我们来说还是个谜”remain后面是表语,相当于to be,可改写为are still a mystery

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B remains 第三人称单数,因为省略了 (to be) remains (to be) a mystery to us