Don't use water to put out the fire if o
问题:
Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
A.shall
B.must
C.may
D.will
Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
A.shall
B.must
C.may
D.will