Some little boys have difficulty ______their hearts into the lesson for a long time.
#61599
A
to put
B
to put
C
putting
D
puting
推荐题目
Listen! Can you hear a man ________? 
#61419
A
cry
B
to cry
C
crying
D
cries
 I didn't sell it. I _______it________.
#59031
A
put…up
B
put…on
C
put …down
D
give …away