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)動作“Look”，可知是正在進行的動作，故用現(xiàn)在進行時，故選C。
點評：根據(jù)時間狀語或動作，是時態(tài)判斷的一種方法。
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