问题描述：
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poor countries can provide effective competition with imports of cheap goods,because wages are so much lower than( )in america.
请问这句话的括号里加these,或什么也不加,哪个正确?
poor countries can provide effective competition with imports of cheap goods,because wages are so much lower than( )in america.
请问这句话的括号里加these,或什么也不加,哪个正确?
问题解答：
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