I used to go mountain—climbing every summer .A. at a timeB. at one timeC. At timesD. At th

发布时间：2020-08-17 13:20:12

    I used to go mountain—climbing every summer .
A. at a time
B. at one time
C. At times
D. At the same time

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A. at a time
(答案→)B. at one time
C. At times
D. At the same time
解析：at a time 一次；at one time 曾经
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