That day we for the train station when Tom fell and hurt his legs badly.A. have been leav

问题补充：

That day, we for the train station when Tom fell and hurt his legs badly.

A. have been leaving

B. were just about to leave

C. have left

D. are just going to leave

答案：

A. have been leaving

(答案→)B. were just about to leave

C. have left

D. are just going to leave

解析：考查固定句式。固定句式be doing sth/be about to do sth when…正在做某事在这时发生了意料之外的事情。When是一个并列连词，意思为“在那时”句意：那一天，我们正要出发去车站，在这时Tom摔倒了伤到了他的腿。故B正确。