The boys when the teacher came in. So she was very angry．
#36667
A
were doing homework
B
were cleaning the classroom
C
were fighting
D
were learning English
推荐题目
The scientists ________ on the new medicine for two years. They will succeed in no time.
#38384
A
work
B
are working
C
have worked
D
will work
—What a clean and bright classroom, isn’t it?—Yes, it’s always clean and bright because it every day.
#39281
A
cleans
B
cleaned
C
is cleaned
D
was cleaned
-Be careful! You might fall into the water. -Thank you. I____.I______ so close to the pool.
#41678
A
didn't know; am standing
B
don't know; am standing
C
didn’t know; was standing
D
didn't know;Would stand