单项选择题

While building a tunnel though the mountains, ______.

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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热门试题

单项选择题

In this experiment, they are woken up several times during the night, and asked to report what they ______.

A. had just been dreaming
B. are just dreaming
C. have just been dreaming
D. had just dreamt

单项选择题

The old man seems ______ here for more than twenty years.

A. to be living
B. to have lived
C. to have been lived
D. to live