问题: 选择题
____ by thick bamboo and high forest, the ancient city hadn't been discovered until the 1990s.
A Surrounding
B Surround
C Surrounded
D Having surrounded
解答:
C 看后面分句，主语是 the ancient city，动词sourround使用被动语态。
完整的句子相当于the ancient city had been surrounded by thick bamboo....
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