________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．
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A
Prevented
B
Preventing
C
Having prevented
D
To prevent
推荐题目
_________ with the size of the whole earth, the biggest ocean does not seem big at all.
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A
compare
B
when comparing
C
comparing
D
when compared
He stood there dumfounded without daring ________ his head as a consequence of his wrong action.
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A
lift
B
to lift
C
turn
D
to rise
The professor explained this theory so clearly that this phenomenon was easy enough ________.
#95942
A
for us to work out
B
working out
C
for working out
D
to working out
_____ of the good results of the exam, the teacher felt very happy.
#91945
A
informed
B
told
C
acknowledged
D
convinced