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
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
单项选择题
Each educational system is not perfect in a strict sense, which has its______.
A) limitations
B) line
C) front
D) advantage
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