单项选择题

Water is ______hydrogen and oxygen.

A．made up
B．made up of
C．made by
D．making by
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单项选择题
Children should be taught how to get along with ______.
A．another
B．other
C．others
D．any other
单项选择题
Somebody ______ here only this morning.
A．must be
B．can be
C．must have been
D．should have been
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