问题

While building a tunnel through the mountain, ______ ．

A:an underground lake was discovered
B:there was an underground lake discovered
C:the workers discovered an underground lake
D:a lake was discovered underground

正确答案是：

同类题型

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I get used to _______ early and going to bed early. It’s a good habit.

The trip from Wuxi to Suzhou about two hours by car.

正确答案网

While building a tunnel through the mountain, ______ ．