--Tree Planting Day is coming. Do you plant trees in spring?---Yes, many trees ________ in our city every year.
#44906
A
are planting
B
are planted
C
were planted
D
will plant
推荐题目
Today, computers are really helpful. They ____ everywhere.
#44613
A
use
B
are used
C
used
D
were used
The old should _____ well.
#44757
A
be take care of
B
look after
C
be looked after
D
be taking care of
---Why is the classroom so dirty? --- Sorry, sir. It ______ yesterday. We forgot to do it. 
#44831
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned
—Oh, this is really an old building.—Do you know when it        ?
#44645
A
has built
B
is built
C
was built
D
will be built