单项选择题

The reason for their unusual behavior remains a puzzle.（）

A．fact
B．mystery
C．statement
D．game

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单项选择题
It seems that only Mary is eligible for the job.（）

A．prepared
B．trained
C．qualified
D．guided
单项选择题
That guy is really witty.（）

A．smart
B．ugly
C．honorable
D．popular
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