问题
选择题
._____________ he used to go skiing in winter but now swimming is his favorite.
A．At a time
B．At one time
C．At no time
D．At times
答案
答案：B
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._____________ he used to go skiing in winter but now swimming is his favorite.
A．At a time
B．At one time
C．At no time
D．At times
答案：B
