we've covered a lot of ground.如题

we've covered a lot of ground.如题 Slow.We've got a lot of shit. We've got a lot of _______(测试) next week. we have covered a lot of ground together.是啥意思 In 1620,about half the U.S.A.was covered by forests.Today the forests have almost gone.A lot of good land has gone with them,leaving only sand.China doesn’t want to copy the U.S.A.’s example.We’re planting more and more trees.We’ve built the 英语翻译In 1620，about half the USA was covered by forests.Today the forests have almost gone.A lot of good land has gone with them，leaving only sand.China doesn't want to copy the USA's example.We're planting more and more trees.We've built t 请问stuff在此句中的意思I think there must've been a lot of questions from the lectures,stuff that wasn't covered in the text. i've got a lot we've,class,lot,in,got,desk,a,our,of,new连词成句 It's quite wet and we've ------- a lot of rain. But they'er not in fashion this year We haven't got many tomatoes, but we've got a lot of potatoes.请问 they'er 后面的’er表示什么but we 've 的VE 是表示什么 I've changed a lot改为感叹句 I've got a lot on my 英语翻译gained a lot of ground ground在这里是什么意思?例如：We've certainly gained a lot of ground on the enterprise side over the last several months We've bought (a lot of food)from the market?(对括号提问）______ ______you_______from the market? I mean we've got a lot going on right now.going on 什么成分?这句话结构不明白. We've had a lot of rain lately.这句话为什么有两个have.都起的啥作用. We've already learnt a lot about Chinese culture and history.对about后的进行提问