【題目】The water supply has been cut off temporarily because the workers ____ one of the main pipes.
A.had repaired
B.have repaired
C.repaired
D.are repairing

【答案】D
【解析】句意：水供應(yīng)被暫時切斷了，因為工人們正在修其中的一根主水管。水供應(yīng)被切斷是因為工人們正在修主水管，故用現(xiàn)在進行時。選D。

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