You can’t imagine this lake used to be a beautiful place in our province .
A. at any time
B. at one time
C. in no time
D. at times
网友回答
A. at any time
(答案→)B. at one time
C. in no time
D. at times
解析：考察介词短语辨析。A无论如何；B以前曾经；C离开，马上；D时而不时；句意：你无法想象这个湖曾经是我们省里一个非常美丽的地方。根据句意说明B正确。