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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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
In my opinion, all people should be ______ for the things they do.
A) popular
B) responsible
C) respectful
D) anxious
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