Robert saw two boys making fun ________ an old man, and then he stopped them.
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A
in
B
on
C
at
D
of
推荐题目
_____  have you been like this?
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A
How often
B
How many
C
How long
D
How old
Guangzhou is    China.
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A
on east of
B
on the east of
C
to east
D
in the east of