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It is said that personal space ranging from 2 to 4 feet is t

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It is said that personal space ranging from 2 to 4 feet is the distance___to separate……空格填什么
It is said that personal space ranging from 2 to 4 feet is the distance___to separate people waiting in lines,so you have to wait behind the yellow line in the bank.
A.maintaining
B.maintains
C.maintained
D.having maintained
要原因和翻译,
It is said that personal space ranging from 2 to 4 feet is t
c 表示被动 被保持