单项选择题

This class ______ now. Miss Gao teaches them.

A．are studying
B．is studying
C．be studying
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单项选择题
Father asked Jack ______ he had stayed out so late.
A．how
B．when
C．why
单项选择题
The population of Shanghai is ______ than that of Shijiazhuang.
A．smaller
B．larger
C．less
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