【题目】Seeing the looks on their faces，we can't really imagine what they are________.
A. going by B. going up
C. going through D. going on
在线课程【答案】C
【解析】考查动词短语。A. going by经过；B. going up上升；C. going through经历； D. going on继续。句意：看着他们脸上的表情，我真的不能想象他们经历了什么事。故选C。