单项选择题

______ in the United States, St. Louis has now become the 24th largest city.

A．Being the fourth biggest city
B．It was once the fourth biggest city
C．Once the fourth biggest city
D．The fourth biggest city it was
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单项选择题
There are still many problems ahead of us, but by this time next year we can see light at the end of the_______.
A．battle
B．day
C．road
D．tunnel
单项选择题
The boy spent as much time watching TV as he______ studying.
A．does
B．had
C．was
D．did
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