People on the grassland of is now Kazakstan were the first to achieve both ri

题干

People on the grassland of is now Kazakstan were the first to achieve both riding and milking horses．

A．where

B．which

C．what

D．as

上一题下一题 0.85难度单项选择更新时间:2013-06-28 09:57:22

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