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【单选题】
5月15日，某投机者在大连商品交易所采用蝶式套利策略，卖出5张7月大豆期货合约，买入10张9月大豆期货合约，卖出5张11月大豆期货合约，成交价格分别为1750元／吨、1760元／吨和1770元/吨。5月30日对冲平仓时的成交价格分别为1740元/吨、1765元／吨和1760元/吨。在不考虑其他因素影响的情况下，该投机者的净收益是( )元。(大豆期货合约每张10吨)A.
1000
B.
2000
C.
1500
D.
150
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