问题补充:
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
答案:
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。