12.Read the text a second time and you will probably know what the principle ______ a hovercraft works.A.is on thatB.has on whichC.is on whichD.on which

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12.Read the text a second time and you will probably know what the principle ______ a hovercraft works.A.is on thatB.has on whichC.is on whichD.on which

12.Read the text a second time and you will probably know what the principle ______ a hovercraft works.A.is on thatB.has on whichC.is on whichD.on which
12.Read the text a second time and you will probably know what the principle ______ a hovercraft works.
A.is on that
B.has on which
C.is on which
D.on which

12.Read the text a second time and you will probably know what the principle ______ a hovercraft works.A.is on thatB.has on whichC.is on whichD.on which
D.