This topic examines the reform of the foreign exchange system.

Realizing the connection between the official exchange rate of RMB and the market exchange rate and establishing a single and managed floating exchange rate system based on market supply and demand are the main achievements of 1994 foreign exchange system reform, so item A is correct.

It is the main achievement of 1994 foreign exchange system reform to implement the system of bank settlement and sale of foreign exchange, cancel the system of foreign exchange retention and repatriation, and realize the conditional convertibility of RMB under current account, so item B is correct.

Establishing the inter-bank foreign exchange market and perfecting the RMB exchange rate formation mechanism are the main achievements of 1994 foreign exchange system reform, so item D is correct.

1996, current account convertibility. At present, the capital account is still controlled and the currency is not fully convertible, so the CE item is wrong.