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The water supply has been cut off temporarily because the workers________one of the main pipes.                                                     (2013·天津，13)

A．had repaired B．have repaired
C．repaired D．a(chǎn)re repairing

D

解析考查動詞時態(tài)。句意為：水供應已暫時被切斷，因為工人們正在維修其中一個主管道。根據(jù)has been cut off判斷應該是現(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，故用現(xiàn)在進行時。

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