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单选题
Water ______ be changed into gas, but it ______ be heated to its boiling point.
A
must; can
B
may; needn’t
C
can; must
D
need; may
参考答案
参考解析
解析：
句意：水能够变成气体，但必须得它达到沸点时才可以。
句意：水能够变成气体，但必须得它达到沸点时才可以。
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