—What’s your impression of the Great Wall?—Wonderful! Once       , it can never be forgotten.
#96766
A
seen
B
seeing
C
being seen
D
saw
推荐题目
I don't want the children ___ out in such weather. 
#94027
A
take
B
to take
C
taken
D
taking
While watching television,          .
#88583
A
the doorbell rang
B
the doorbell rings
C
we heard the doorbell ring
D
we heard the doorbell rings
____ in thought, he almost ran into the car in front him.
#94335
A
Losing
B
Having lost
C
Lost
D
To lose
Seeing the picture ,she could resist _____. 
#97279
A
laughing
B
to laugh
C
laughed
D
being laughed