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
— 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