问题
选择题
| — The students have been to the Great Wall. — Really? When ______ there? |
A. will they go B. did they go C. do they go D. have they gone |
答案
答案：B
搜题请搜索小程序“爱下问搜题”
| — The students have been to the Great Wall. — Really? When ______ there? |
A. will they go B. did they go C. do they go D. have they gone |
答案：B
质点A通过的路程是__________cm，质点C的位移是__________cm.