25. ―Look! What a mistake! Why?―Sorry, I _________ on it.A.don’t concentrateB.hadn’t concentratedC.h

题目简介

25. ―Look! What a mistake! Why?―Sorry, I _________ on it.A.don’t concentrateB.hadn’t concentratedC.h

题目详情

 
25. ―Look! What a mistake! Why?
―Sorry, I _________ on it.
A.don’t concentrateB.hadn’t concentrated
C.haven’t been concentratingD.wasn’t concentrating
题型:单选题难度:偏易来源:不详

答案

D

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