题目:
A terrible terrorist attack at the train station in Kunming, on March 1, 2014 29 death and more than 140 injuries.
A.occurred; caused
B.happened; caused
C.occurred; causing
D.happened; to cause
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B, C解析:套期保值的基本做法有两种:①持有现货空头,买入期货合约;②持有现货多头,卖出期货合约。