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--- Look!Somebody ___ the sofa.
--- Well,it wasn’t me. I didn’t do it.
A．is cleaningB．was cleaning
C．has cleanedD．had cleaned
C

試題分析：考查時態(tài)：句意：---看，沙發(fā)已經(jīng)被清理干凈了。---呃，不是我做的。這里強調(diào)的是過去發(fā)生的動作對現(xiàn)在的影響。所以要用完成時態(tài)。同時，這個過去發(fā)生的動作到說話時已經(jīng)完成，而不是一直進行下去，所以用現(xiàn)在完成時。選C。
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