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assoonas的用法Assoonastheyheardtheloudnoise,theywentouttoseewhat()AwashappeningBwashappenedChashappenedDwillhappen为什么答案是A而C不行?

题目详情
as soon as的用法
As soon as they heard the loud noise,they went out to see what()A was happening B was happened C has happened D will happen
为什么答案是A而C不行?
▼优质解答
答案和解析
英语强调时态一致,C是现在完成时.句子的主时态是过去时,所选的选项也应该是过去某种时态