Now there are already robots _________ in factories.
#50464
A
working
B
to work
C
work
D
worked
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People living in cold climates prefer to use warm clours a warm and comfortable feeling there.
#50262
A
to create
B
to creating
C
creates
D
create
-Have you seen Mr. Black these days, Jack?-Yes, I met him when I ________ in the street yesterday.
#49575
A
walked
B
was walking
C
have walked
D
is walking