请教大全351

1.        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.

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

(B) speculators who had bought on margin; having had to sell,

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

(D) speculators, those who had bought on margin; these speculators had to sell, and（C）

(E) speculators, who, having bought on margin and having to sell

A和C的主要区别是A用了分词,而C用了不定式,是否因为分词强调重复性动作,而从句强调一次性动作,故A不正确

我认为A选项的结构有问题，因为省略引导词，导致了两个谓语结构。不知道对不对？！