问题补充:
Start studying early and don’t study too much.
A. at one time
B. at a time
C. at times
D. from time to time
答案:
A. at one time
(答案→)B. at a time
C. at times
D. from time to time
解析:at a time 一次;at one time曾经,一度。at times=from time to time有时候。
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