----The train will arrive at the station in half an hour. Who for us?
----I am sure Dad will be standing there when we get off the train.
A. will be waiting
B. was to wait
C. wait
D. was about to wait
网友回答
(答案→)A. will be waiting
B. was to wait
C. wait
D. was about to wait
解析：考查时态：从答语的Dad will be standing there，可知问的是：谁在等我们？用将来进行时，句意：--火车还有半小时就到了。谁会在等我们呢？--我能肯定当我们下火车的时候爸爸一定在等我们呢。选A。