题目:
My mother is ill. I have to at home. |
A. look at her B. look for her C. stay D. look after her |
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, D解析:证券投资的系统风险包括价格风险、再投资风险和购买力风险,违约风险、变现风险和破产风险属于非系统风险。