单项选择题

You have to read the manual carefully first, otherwise you ______ have difficulty using the cell phone.

A．should
B．will
C．might
D．may
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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
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
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