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—Look! Somebody ______the blackboard.
—Well, it wasn't me.I didn't do it.
A.is cleaningB.was cleaning
C.had cleanedD.has cleaned
D

试题分析:考查时态:句意:--看有人擦过黑板了。---哦,不是我,我没做。从句意看这句话强调的是现在黑板被擦过的结果,用现在完成时。选D。
点评:考查时态题,如果有时间状语,就充分利用时间状语,如果没有,要结合上下文找出来。这句话的it wasn't me.I didn't do it.就是明显的暗示
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