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1.What has the machine “The Revealer” been used to do?
It has been used to detect gold which has been buried in the ground.
2. Why did the party go into a cave near the seashore?
It is said that the pirates used to hide gold in it.
3. What did the party find after search the cave thoroughly?
They found an empty tin trunk.
A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.
used to 与 would 都可用来描述在过去某一段时间内的习惯性动作或经常做的事。
二者区别在于
used to 可用来表示现在与过去对比，而would 不能。
I have given up smoking . I used to smoke very heavily .
2) would 只表示过去重复的动作，used to还可表示过去的状态和情况。
This sort of novel used to be very popular .
3) would 可与often , always , frequently , sometimes等时间副词连用。
