A bird was heard __________in the tree just now.A.singing B.sing _英语解答

A bird was heard __________in the tree just now.
A.singing B.sing C.to sing D.sang

人气：175 ℃　时间：2020-05-30 14:30:12

解答

很高兴能帮你解答.
答案：C
解析：当hear sb.do/doing sth.用在被动语态时要用to,即sb.be heard to do sth.