When you are planting trees, the trees ________ straight in the hole.
#36844
A
must put
B
must be put
C
are putting
D
is put
推荐题目
When I arrived at the cinema, the movie___________for10 minutes. 
#37965
A
has begun
B
had begun
C
had been on
D
has been
My cousin is a secretary. She ______in that company for over six years.
#41764
A
will work
B
is working
C
has worked
D
works
He _____ in this factory for 20 years already.
#36321
A
will work
B
works
C
has worked
D
is working