Look! The tree is growing well. When______? 
#44523
A
was it planted
B
did it plant
C
will it be planted
D
is it planted[
推荐题目
The radio says a wild animal zoo is going to ____ in our city. 
#44930
A
be built
B
built
C
build
D
be building
This kind of books _____ well and they _____ out last week.
#44810
A
sells; were sold
B
is sold; sold
C
sells; sold
D
is sold; were sold
-How clean and tidy your bedroom is! -Thank you. It ________ every day:
#44719
A
cleans
B
is cleaned
C
was cleaned
D
is cleaning
---It’s difficult for the villagers to cross the river. ---I think a bridge______ over the river.
#44765
A
should be built
B
is being built
C
has been built
D
was built