单项选择题

He hurried to the booking office only ______ that all the tickets had been sold out.

A.to tell
B.to be told
C.telling
D.told
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单项选择题
Such animals as South China tigers are believed ______, for we’ve had no track of them for ages.
A.becoming extinct
B.to become
C.to have been extinct
D.having been extinct
单项选择题
Over the past decades, sea ice ______ in the Arctic as a result of global warming.
A.had decreased
B.decreased
C.has been decreasing
D.is decreasing
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