单项选择题

Can you imagine the difficulty I had ______ language obstacles I first studied abroad

A.to overcome
B.overcoming
C.overcome
D.overcame
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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
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
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