The water supply has been cut off temporarily because the workers________one of the main pipes.                                                     (2013·天津，13)
A．had repairedB．have repaired
C．repairedD．a(chǎn)re repairing
D

考查動(dòng)詞時(shí)態(tài)。句意為：水供應(yīng)已暫時(shí)被切斷，因?yàn)楣と藗冋诰S修其中一個(gè)主管道。根據(jù)has been cut off判斷應(yīng)該是現(xiàn)在的某種時(shí)態(tài)。再根據(jù)時(shí)間狀語(yǔ)temporarily可以判斷出repair是現(xiàn)在正在發(fā)生的動(dòng)作，故用現(xiàn)在進(jìn)行時(shí)。
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