31. All his attentionon the computer game, so he even didn't notice his mother enter the r

发布时间：2020-08-16 06:20:36


31. All his attention    on the puter game, so he even didn't notice his mother enter the room.
A. has been fixed
B. was fixing
C. was fixed
D. Fixed

网友回答

A. has been fixed
B. was fixing
(答案→)C. was fixed
D. Fixed
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