25. ―Look! What a mistake! Why? ―Sorry,
题型:选择题
问题:
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
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