During the tourist season, there are many people wandering in this city to see the old castles_____ in the sixteenth century.
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A
to be built
B
being built
C
having been built
D
built
推荐题目
How pleased the detective was _____ what his customer told him!
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A
hearing
B
heard
C
to hearing
D
to hear
The old man needs _________ .
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A
looking after
B
being looked after
C
to look after
D
look after
The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day. 
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A
thought about
B
to think about
C
thinking about
D
having thought about