The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.
#98470
A
seeing
B
having seen
C
to see
D
to have seen
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________ the course very difficult，she decided to move to a lower level.(2013·北京，24)
#88738
A
Find
B
Finding
C
To find
D
Found
Hearing loss in a large number of teenagers______ caused because of their listening to loud music.
#90729
A
is
B
has
C
are
D
have
—I would like to buy an expensive camera.—Well, we have several models_____ .
#98922
A
to choose from
B
to choose
C
to be chosen
D
for choice