单项选择题

He studied hard at school when he was young, ______ contributes to his success in later life.

A．which
B．that
C．what
D．each of which
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单项选择题
With a school record like yours, ______ why you didn ' t try for a university scholarship.
A．I' m shocked
B．I' m puzzled
C．I' m amazed
D．I feel pity
单项选择题
The cost of the air fare is higher than ______
A．the rail fare
B．that of the rail fare
C．those of the rail fare
D．which of the rail fare
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