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He has been back        .
#48270
A
since a month
B
for a month
C
for a month ago
D
in a month
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We’d better not keep the lights______ when we have PE classes outside.
#48235
A
off
B
on
C
open
D
closed
---What are you reading? --- The Old Man and the Sea      Hemingway.
#46712
A
in
B
for
C
of
D
by
Robots（机器人）are        to do the same things       people.
#48678
A
enough clever；as
B
clever enough；as
C
enough clever；with
D
clever enough；with
 — Where is Jenny?— She is doing her homework ______ the classroom.
#45807
A
of
B
on
C
in
D
to
Lucy lived in Beijing from 2008____________ 2012.
#47788
A
on
B
to
C
at
D
of