25. ―Look! What a mistake! Why?
―Sorry, I _________ on it.
A.don’t concentrate | B.hadn’t concentrated |
C.haven’t been concentrating | D.wasn’t concentrating |
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25. ―Look! What a mistake! Why?
―Sorry, I _________ on it.
A.don’t concentrate | B.hadn’t concentrated |
C.haven’t been concentrating | D.wasn’t concentrating |