I found him in the office.A.sing B.sings C.was singing

问题描述:

I found him in the office.A.sing B.sings C.was singing
快,
不要乱回答,乱回答祝愿你没好报

singing对不起姐还是哥呀、请在 A. sing B. sings C. was singing选一个。我现在问题是有没有find sb was doing sth???????????????????????????????????????????????????????????????????????????????????肯定还有个D,singing要么答案出错了