The US Treasury again found that neither China nor any other trading partners was manipulating its currency, according to the semi-annual report.
But Treasury called on the Asian economic giant to avoid allowing the renminbi to weaken persistently.
While the report released on Tuesday said "direct intervention by the People's Bank of China in the last year has been limited," Treasury said in a statement that it "continues to urge China to take the necessary steps to avoid a persistently weak currency."
With the new expanded list, Treasury put nine trading partners, including China, on the "monitoring list" of countries "that merit close attention to their currency practices."
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