Step 1: Understand the question
The question asks about the main functions of the foreign exchange futures market.

Step 2: Identify the main functions of the foreign exchange futures market
The foreign exchange futures market is a platform where participants can buy or sell currencies at a predetermined price on a specific future date、The main functions of this market include hedging against currency risk, speculating on currency price movements, and arbitraging between different markets.

Step 3: List the main functions
1、套期保值 (Hedging): This involves reducing or managing risk by taking a position in the futures market that is opposite to the position held in the spot market、It helps protect against potential losses due to currency fluctuations.

2、投机 (Speculation): Speculators buy or sell futures contracts with the aim of making a profit from anticipated price movements、They do not have an underlying exposure to hedge.

3、套利 (Arbitrage): Arbitrage involves taking advantage of price differences between two or more markets、In the context of foreign exchange futures, it could involve exploiting differences between the futures market and the spot market or between different futures contracts.

Step 4: Match the functions to the given options
Given that the specific options are not listed, we can infer based on common knowledge about financial markets that the main functions include hedging, speculation, and arbitrage.

The best answer is ABC.