The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.
#89139
A
seeing
B
having seen
C
to see
D
to have seen
推荐题目
We should think of ways to stop the waste from the factory _____ our living environment. 
#97826
A
being polluted
B
polluting
C
from being polluted
D
Polluted
Knowing how to give first aid really ______ in case of emergency. It can save lives. 
#96925
A
makes difference
B
has a difference
C
makes a difference
D
makes the difference