michael___ a chinese song 1.sing 2.sang 3.sings 4.singing

问题描述:

michael___ a chinese song 1.sing 2.sang 3.sings 4.singing

2.sang
歌已经唱了,用过去式.
而且唱歌如果用单数的话,只能表示某个人每天都喜欢唱歌,而这句话没说明这一点,那只能是唱过了.