I did a lot of christmas shopping.a lot of 可以改成 a number of

I did a lot of christmas shopping.a lot of 可以改成 a number of I did a lot of christmas shopping.怎么翻译? I did a lot of shopping I did a lot of Christmas shopping.a lot of为什么不可以换成 a piece o I did a lot of work yesterday. I bet you get a lot of Christmas presents! much.mamy.a lot of.plenty of.a number of a lot of```lot of .a lots of .few .a few .a number of ,the n I （ ）a lot of a lot of 与 a number of 的区别 a lot of = a number of 吗? a number of 与a lot of的区别