Look out! That tree fall down.A. is going to B. will be C. shall D. would

问题补充：

Look out! That tree fall down.

A. is going to

B. will be

C. shall

D. would

答案：

(答案→)A. is going to

B. will be

C. shall

D. would

解析：考查时态：句意:当心，那棵树要倒下了。用一般将来时，因为是有迹象表明的，用be going to do。Will do表示“愿意或是临时决定”。选A。