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
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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