单选题：According to the passage, when does a trade imbalance occur?

题目分类：英语三级A级
题目类型：单选题
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题目内容：

According to the passage, when does a trade imbalance occur? A．When a country has serious economic problem.
B．When a country sells more products overseas thanit imports.
C．When the value of the products a country importsis greater than the value of the product it exports.
D．Whena country can't develop its natural resources.

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