——Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.
#41937
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned
推荐题目
If any accident ______ here tomorrow, it will be very serious.
#42462
A
happens
B
will be happened
C
will happen
D
is happened
Mary ______ in Beijing since 2008.
#39884
A
have lived
B
is lived
C
lived
D
has lived
Listen, a small number of students ______ in the classroom. 
#40135
A
talk
B
talks
C
is talking
D
are talking
–– How do you like the film AVATAR?–– Great! I _______ such a wonderful film before.
#39669
A
don’t see
B
won’t see
C
have never seen
D
have already seen