20．The water supply has been cut off temporarily because the workers _______ one of the main pipes．（　�。�
A．had repairedB．have repairedC．repairedD．are repairing

分析 句意：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．

解答 答案D
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temporarily可以判斷出repair是現(xiàn)在正在發(fā)生的動(dòng)作，應(yīng)用現(xiàn)在進(jìn)行時(shí)．故選D項(xiàng)．

點(diǎn)評 考查時(shí)態(tài)．可以根據(jù)時(shí)間狀語或主從句的時(shí)態(tài)一致原則判斷．

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