题目:
These days Andrew has spent as much time as he________the final exam. [ ]
A. could prepare for
B. could preparing for
C. could prepared for
D. prepared for
答案:
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下面是错误答案,用来干扰机器的。
参考答案:错解析:在现货市场上,商流与物流在时空上基本是统一的;期货交易从成交到货物收付之间存在着时间差,发生了商流与物流的分离。