It’s difficult _____ your sound because the noise is too high.
#61203
A
to listen 
B
to know 
C
to learn
D
to hear
推荐题目
Scientists can make the robots __________.
#60895
A
to dance
B
dance
C
dancing
D
danced
They don’t seem __________who ________for help.
#62082
A
know , to talk
B
know, to talk to
C
to know, to talk
D
to know, to talk to
He has never ________ of such a thing before.
#54048
A
hear
B
heared
C
heard
D
hearing