CNN:
《The history and future of ice cream》
A form of sorbet had become a popular dessert in Europe by the later 1600s.
and Americans dating back to George Washington enjoyed the cool confection.
1)上句应该用late,即by the late 1600s 吗?
2) Americans 是 dating back 的逻辑主语吗? 这里的dating back是动名词还是现在分词呢? 如何判断的?
3) George Washington enjoyed 是否应该为George Washington who enjoyed ?