当今世界正经历百年未有之大变局，面对时代之问，中国方案是推动构建（），世界各国共建持久和平、普遍安全、共同繁荣、开放包容、清洁美丽的世界。

A. I’m sorry to tell you that the specification of the product is not in conformity with the contract.
B. I’m sorry to tell you that the quality of last cargo is rather bad/inferior.
C. I’m sorry to tell you that we have to return the goods.

A. 我们保换不合格的产品。
B. 我们保证不发合格的产品。
C. 我们保换产品。