Tim what are you doing here?-I ( ) the bus wait应该用什么时态填到空里

题目

Tim what are you doing here?-I ( ) the bus wait应该用什么时态填到空里
wait for 我也觉得是am waiting for

答案

am waiting for
I am waiting for the bus 我正在等公车.
be doing 现在进行时,表示正在做某事；
不可能是 wait for 的,因为提问句式 what are you doing?be doing 就是问正在做什么啊