单项选择题

[A] Although [C] Unless
[B] If [D] Until

A．Although
B．If
C．Unless
D．Until
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单项选择题
[A] of [C] for[B] about [D] into
A．of
B．about
C．for
D．into
单项选择题
What's the author's tone in the last sentence of the passage
A．Objective.
B．Ironical.
C．Approving.
D．Enthusiastic.
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