—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
He studied hard, __________ the exam.
#93042
A
aim at
B
aiming at passing
C
aiming passing
D
aiming to passing
The question is not easy _____.
#97945
A
to answer
B
to be answered
C
answered
D
answering
Tom always prefers _________on foot rather than _______ a bike.
#95685
A
walk; ride
B
walk; riding
C
to walk; ride
D
riding; to ride