单项选择题

Lorie waited over an hour for Ken. He really ______ have called her, don"t you think

A．must
B．would
C．may
D．should
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单项选择题
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
单项选择题
—Would you like me to go to the dentist with you—No, you ______ with me.
A．need not to go
B．need not go
C．do not need go
D．not need go
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