Economists estimate that up to 20% of trade between nations 【is subject to】 some form of countertrade.
A.is free from B.is exchanged by C.is governed by D.is out of正确答案C
Economists estimate that up to 20% of trade between nations 【is subject to】 some form of countertrade.
A.is free from B.is exchanged by C.is governed by D.is out of正确答案C