I ________ the living room．Look，it is clean．
A．clean               B．a(chǎn)m cleaning     C．have cleaned
C

試題分析：根據(jù)動(dòng)作“Look”，可知是正在進(jìn)行的動(dòng)作，故用現(xiàn)在進(jìn)行時(shí)，故選C。
點(diǎn)評(píng)：根據(jù)時(shí)間狀語(yǔ)或動(dòng)作，是時(shí)態(tài)判斷的一種方法。
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