Question

英语高手来帮忙

When they through the forest, abear at them
A.walked was coming B.were walking came C.were walking comes D.walk is coming
为什么不选A?

Be careful The train
A.will come B.come C.comes D.is coming
为什么不选A?

Answer 1

When they were walking through the forest, a bear came at them.主句是a bear came at them。When they were walking through the forest是时间状语，正当他们走过森林时。
Be careful， the train is coming.当心，火车正在向这边开过来。通常翻译为：火车要来了。按中文意思是 will come，但不符合英语习惯。例如：我要走了。I'm going.而不是I will go.

Answer 2

1.意思是“当他们正在穿越森林时，一头熊出现在他们面前”，前半句是过去进行时，所以应该用ing
2.意思是“当心火车正朝这里开来”，用ing

Answer 3

1.themselves
2.hurried
3.talking
错了别怪我！~~~~