问题描述：
英语翻译
The avidness with which merchants and landowners in early-nineteenth-century Maryland and Virginia sought Joshua Johnston'sprofessional services attests to his artistic skill as a portrait painter.
解释一下它的语法构成,固定搭配,特殊句型等
The avidness with which merchants and landowners in early-nineteenth-century Maryland and Virginia sought Joshua Johnston'sprofessional services attests to his artistic skill as a portrait painter.
解释一下它的语法构成,固定搭配,特殊句型等
问题解答：
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