问题
选择题
Later, these rocks proved that ___ in the distant past the Antarctic was covered by plants.
A．at one time
B．at a time
C．at times
D．at the same time
答案
答案：A
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Later, these rocks proved that ___ in the distant past the Antarctic was covered by plants.
A．at one time
B．at a time
C．at times
D．at the same time
答案：A