-----of the twins has been here before.A.NeitherB.NoneC.BothD.Each

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-----of the twins has been here before.A.NeitherB.NoneC.BothD.Each

-----of the twins has been here before.A.NeitherB.NoneC.BothD.Each
-----of the twins has been here before.
A.Neither
B.None
C.Both
D.Each

-----of the twins has been here before.A.NeitherB.NoneC.BothD.Each
A,从twins(双胞胎)中可以看出是两个人 ,none是不行的,因为要用于3个人或以上的才行.Both的话就要用复数了,但后面有has been,所以也不能用.
至于最后的each,也是用于3个人或以上的.只有neither是讲两个人的,而且是否定.

A.