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[主观题]
They have ______________ on a journey round the world.A.set offB.set backC.set upD.set a
They have ______________ on a journey round the world.
A.set off
B.set back
C.set up
D.set aside
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They have ______________ on a journey round the world.
A.set off
B.set back
C.set up
D.set aside