Water____changed into gas at a high temperture.A.must be B.were C.can be D.should be应该选什么?原因?

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Water____changed into gas at a high temperture.A.must be B.were C.can be D.should be应该选什么?原因?
Water____changed into gas at a high temperture.
A.must be B.were C.can be D.should be
应该选什么?原因?

Water____changed into gas at a high temperture.A.must be B.were C.can be D.should be应该选什么?原因?
C
水在高温下能变成气体

c