—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

試題分析：考查時態(tài)：句意：--看有人擦過黑板了。---哦，不是我，我沒做。從句意看這句話強(qiáng)調(diào)的是現(xiàn)在黑板被擦過的結(jié)果，用現(xiàn)在完成時。選D。
點(diǎn)評：考查時態(tài)題，如果有時間狀語，就充分利用時間狀語，如果沒有，要結(jié)合上下文找出來。這句話的it wasn't me．I didn't do it．就是明顯的暗示
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