讨论补充题－27

lost_my_account

In 1929 relatively small declines in the market ruined many speculators having bought on margin; they had to sell, and their selling pushed other investors to the brink.C

(A)  speculators having bought on margin; they had to sell, and

(C) speculators who had bought on margin; they had to sell, and

having bought on margin does not precisely establish a sequence of events; who had bought on margin is needed to indicate that the speculators made their purchases before there were declines in the market and before they were forced to sell.

答案选C无疑。。相比having bought on margin，who had bought on margin清楚多了，但是我不知道，如果这里用前者是不是也说得通。

rt316

其实你已经知道‘相比having bought on margin，who had bought on margin清楚多了’，清楚在时态的先后顺序表达上，而ing结构无法表达这种时态上明确的先后关系，所以用ing不合适；ing通常用在表达动作的伴随或正在进行，显然这种用法在本句中是不合适的。

lost_my_account

谢谢stoneren，，