单项选择题

A．may
B．must
C．should
D．need
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单项选择题
A．The man will not be able to sleep.B．Someone will enter the back door while the man is sleeping.C．The lock on the door will break.D．The man will not be able to come back.
A．The man will not be able to sleep.
B．Someone will enter the back door while the man is sleeping.
C．The lock on the door will break.
D．The man will not be able to come back.
单项选择题
A．The function of brain.B．The function of nerve cells.C．The five senses.D．The chemical processes.
A．The function of brain.
B．The function of nerve cells.
C．The five senses.
D．The chemical processes.
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