(湖南省怀化市2014年高三第二次模拟考试)31. I still remember ______ to the hospital, supported by my class teacher when I was ill at school. 
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A
to be taken
B
being taken
C
to take
D
taking
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The element radium, ______ in the chemistry lab, gave off a blue light.
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A
discovering
B
to be discovered
C
to discover
D
discovered
More and more carbon dioxide is being released into the air,________the more severe global warming effects.
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A
contributed to
B
to contribute to
C
contributing to
D
to be contributed to
The children went back home from the grammar school, their lessons ________ for the day.
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A
finishing
B
had been finished
C
finished
D
had finished