单项选择题

The reason for unusual behavior remains a puzzle.（）

A．fact
B．mystery
C．statement
D．game

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单项选择题

Sometimes it is advisable to book hotels in advance.（）

A．possible
B．profitable
C．easy
D．wise

单项选择题

Jack eventually overtook the last truck.（）

A．hit
B．passed
C．reached
D．led

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