The research mainly deals with the difficulty the students have ______ their attention pm their study all the time.
#67421
A
to focus
B
to be focused
C
focusing
D
focused
推荐题目
This website is for those of us who can’t it to Tibet to enjoy the beautiful scenery.
#73708
A
go
B
take
C
get
D
make
This nice magazine _____ your brother.
#66488
A
is belonged to
B
belongs to
C
has been belonged to
D
is belonging to
The children remembered to ______ themselves at first, but things went out of control minutes later.
#70073
A
produce
B
behave
C
practice
D
enjoy
People have planted a lot of trees and grass in order to ____ wind and sand in the desert．
#81065
A
hold down
B
hold up
C
hold back
D
hold out