国家旅游局统计:how have you found the course？是什么意思？

how have you found the course？是什么意思？ How much have you spent? What two things can't you have for breakfast?How many sweets can you put into an empty bag? do you have been qinghai lake? how how many thorium bar have you 是什么意思？ how long have you been 用法 Hi ,How have you been ? 是什么意思？ How long have you _______(have) this book? How long have you been collecting shells？与How long have you collected shells?的区别 How long have you been collecting shells？与How long have you collected shells?的区别