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)已暫時被切斷，因為工人們正在維修其中一個主管道．

解答 答案D
根據(jù)has been cut off判斷應(yīng)該是現(xiàn)在的某種時態(tài)．再根據(jù)時間狀語temporarily可以判斷出repair是現(xiàn)在正在發(fā)生的動作，應(yīng)用現(xiàn)在進行時．故選D項．

點評 考查時態(tài)．可以根據(jù)時間狀語或主從句的時態(tài)一致原則判斷．

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