单项选择题

The doctor said that the patient would die ______ he was sent to hospital immediately.

A．then
B．but
C．except
D．unless
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单项选择题
Just as music is a universal language,______.
A．so it is a mirror of the time
B．as a mirror of the time
C．it is also a mirror of the time
D．so is a mirror of the time
单项选择题
Will you tell me which key is the one ______ the mailbox
A．of
B．to
C．for
D．on
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