单项选择题

Father asked Jack ______ he had stayed out so late.

A．how
B．when
C．why
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单项选择题
The population of Shanghai is ______ than that of Shijiazhuang.
A．smaller
B．larger
C．less
单项选择题
--Who's that speaking
A．I am Jack
B．This is Jack speaking
C．Jack is me
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