问题补充:
When Marx was in London, he read at the library for hours.
A. would
B. might
C. could
D. should
答案:
(答案→)A. would
B. might
C. could
D. should
解析:考察情态动词用法。情态动词would表示过去常常做某事,而且现在还可能在做。Might表示也许,用于肯定句指,是一种可能性很小的推测。Could能够;should应该,竟然;句意:当马克思在伦敦的时候,他经常在图书馆里阅读好几个小时。故A正确。