單項選擇題It is no （） arguing about this problem, because our agent will never change his mind.
A.help
B.good
C.use
D.worth
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1.單項選擇題I am sorry （） waiting for a long time.
A.to keeping you
B.to kept you
C.to have kept you
D.kept you
2.單項選擇題By this time tomorrow, the ship （）its repair work in the engine room.
A.will do
B.has done
C.had done
D.will have done
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