The two balls fell the same speed and landed the ground at the same time.A. off;onB. by;i

发布时间：2020-08-17 13:40:53

The two balls fell     the same speed and landed     the ground at the same time.
A. off;on
B. by;in
C. with;on
D. at;on

网友回答

A. off;on
B. by;in
C. with;on
D. at;on
解析：at the same speed以同样的速度；on the ground在地面上。
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