单项选择题

We carved their names on the stone so that younger generations could know what their forefathers______for the nation.

A．did
B．were doing
C．had done
D．have been doing
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单项选择题
Nobody noticed the thief enter the house because the lights happened to______.
A．be put up
B．give in
C．be turned on
D．go out
单项选择题
Staying in a hotel costs______renting a room in a dormitory for a week.
A．twice as much as
B．twice than
C．as much twice as
D．as much twice
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