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【参考答案】

去掉each。
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现代社会中竞争无处不在2．竞争和合作的关系
单项选择题
A．He is questioning whether or not to take a break.B．He is discussing his plan to plant a tree.C．He is mentioning a car accident.D．He is talking about a fight.
A．He is questioning whether or not to take a break.
B．He is discussing his plan to plant a tree.
C．He is mentioning a car accident.
D．He is talking about a fight.
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