单项选择题

Which is the flight to Hong Kong（）

A. LH4521
B. LH4152
C. LH4125

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单项选择题
31（）

A．where
B．who
C．why
单项选择题
The biggest problem with the computer is that
A．it is difficult for her to know the program well.
B．it regularly stops working.
C．the monitor is too small.
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