问题描述:
has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?
A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been used to detect gold是什么时态?used to 是表示过去常常做某事的意思吗?has been buried in the ground这句是现在现成时的被动态吗?请详解.
A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been used to detect gold是什么时态?used to 是表示过去常常做某事的意思吗?has been buried in the ground这句是现在现成时的被动态吗?请详解.
问题解答:
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