During the tourist season, there are many people wandering in this city to see t
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During the tourist season, there are many people wandering in this city to
see the old castles _____ in the sixteenth century.
A. to be built B. being built
C. having been built D. built
试题答案
D
解析:
非谓语动词的动作先于句中谓语动词的动作时， 用过去分词。