题目选项分析

Although coin clipping, a practice in which small amounts of silver or gold would be chipped from a coin to be sold as bullion, was made more difficult in England by the introduction of coin milling machines in 1662, it remained common until the end of the century before all the old unmilled coins were removed from circulation.

Although coin clipping, a practice in which small amounts of silver or gold would be chipped from a coin to be sold as bullion, was made more difficult in England by the introduction of coin milling machines in 1662, it remained common until the end of the century before all the old unmilled coins were removed from circulation.