Don’t make a noise! They _______on a physics problem now.
#41516
A
will work
B
are working
C
worked
D
have worked
推荐题目
I my homework while my mother was reading a book last night.
#40089
A
did
B
do
C
was doing
D
were doing
---I have finished my homework already, mum.--- When ________ you ________ it?
#39868
A
did; finished
B
did; finish
C
have ; finished
D
were; finishing
---I hear Sam has gone to Qingdao for a holiday.---Oh, how nice! Do you know when he________?
#36768
A
was leaving
B
has left
C
left
D
leaves
— Mary, can you help me?— Wait a moment. I dinner now.
#42046
A
cook
B
cooked
C
was cooking
D
am cooking