问题
选择题
—Why is the classroom so dirty?
—Sorry , sir. It ____ yesterday. We forgot to do it.[ ]
A. doesn't clean
B. didn't clean
C. isn't cleaned
D. wasn't cleaned
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Why is the classroom so dirty?
—Sorry , sir. It ____ yesterday. We forgot to do it.[ ]
A. doesn't clean
B. didn't clean
C. isn't cleaned
D. wasn't cleaned
答案：D