He knew that cholera would never be controlled _____ its cause was found.A．tillB_刷题宝

题干

He knew that cholera would never be controlled _____ its cause was found.

A．till

B．still

C．until

D．kill

上一题下一题 0.64难度单项选择更新时间:2011-12-19 11:21:55

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