The Great Wall was built to keep ______  the invaders. 
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A
in
B
out
C
up
D
off
推荐题目
Everyone in the class is expected to________in the discussion.
#65642
A
participate
B
attend
C
donate
D
declare
The TV programme has ______ on the children as_______as the old.
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A
a good effect; good
B
a positive effect; well
C
a good affect; well
D
affect; well