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
______ the children to bed, she began to correct the students' exercises.
A．Sending
B．Being sent
C．Sent
D．Having sent
单项选择题
The writer was so absorbed ______ his job that he did not notice me enter the room.
A．on
B．of
C．in
D．at
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