Later, these rocks proved that in the distant past the Antarctic was covered by plants.A.

发布时间：2020-08-16 08:23:14


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

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(答案→)A. at one time
B. at a time
C. at times
D. at the same time
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