问题
选择题
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
答案：B
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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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：B
at a time 一次；at one time曾经，一度。at times="from" time to time有时候。