________ deep down in the earth for thousands of years, the dead forest has rotted away and become coal．
#89907
A
Having buried
B
Being buried
C
Buried
D
To be buried
推荐题目
________ with some research materials, he decided on three possible approaches in his experiment.
#90081
A
Preparing
B
Prepared
C
Having prepared
D
Prepare
The Arctic is considered _____ the northern part of the Atlantic.
#98292
A
having been
B
to have been
C
to be
D
being
________ her leg the last time, Brenda decided not to go on the school skiing trip this year.
#88779
A
Breaking
B
Broken
C
To break
D
Having broken
In my opinion，keeping dogs should not be banned，but ______ to certain areas.
#98132
A
limited
B
limiting
C
to limit
D
to be limited