My mother is busy_____ the room.
#49979
A
clean
B
to clean
C
cleaning
D
cleans
推荐题目
They were made _______ the whole night. 
#50613
A
working
B
work
C
to work
D
worked
______nature reserves _______us learn more about protecting animals.
#48781
A
Studying ; help
B
Studies ; helps
C
To study; helping
D
Studying; helps
I’d like a piece of paper____.
#50592
A
to write
B
to be writing
C
to write on
D
to write with
Why not _____ an English club to practice ______ English?
#49695
A
to join; to speak
B
join; speaking
C
join; to speak
D
to join ; speaking