While building a tunnel through the mountain, . A. an underground lake was discovered B. there was an underground lake discovered C. a lake was discovered underground D. the workers discovered an underground lake [解析]当分词作状语时.其逻辑主语就是句子主语.又因为现在分词表主动.进行.过去分词表被动.完成.所以只有选项D中的主语the workers才能发出building这个动作. 答案:D 查看更多

 

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While building a tunnel through the mountain, _______.

A. an underground lake was discovered

B. there was an underground lake discovered

C. a lake was discovered underground

D. the workers discovered an underground lake

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While building a tunnel through the mountain,  ______ .
[     ]
A. an underground lake was discovered   
B. there was an underground lake discovered
C. a lake was discovered underground
D. the workers discovered an underground lake 

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16. While building a tunnel through the mountain, _______ .

A) an underground lake was discovered

B) there was an underground lake discovered

C) a lake was discovered underground

D) the workers discovered an underground lake

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 While building a tunnel through the mountain, ________ .

A. an underground lake was discovered  

B. there was an underground lake discovered

C. a lake was discovered underground   

D. the workers discovered an underground lake

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While building a tunnel through the mountain, ________ .

A. an underground lake was discovered

B. there was an underground lake discovered

C. a lake was discovered underground  

D. the workers discovered an underground lake

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