单项选择题

It is a complicated problem．（）

A．strange
B．complex
C．difficult
D．unusual

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单项选择题

But ultimately he gave in．（）

A． undoubtedly
B． certainly
C． finally
D．necessarily

单项选择题

Most of the butterflies perish in the first frosts of autumn（）

A．die
B．disappear
C． migrate
D．vanish

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