---Where's Mary now? Do you know?
---No,but I heard __________ in her room a few minutes ago.
A.her singing B.her sing C.she was singing D.All the answers are right
How to choose,translate and why? Thanks.
您好!这道题网友选:A .但《典中点》八年级英语(上)Unit 3 给的答案是:D .这答案有误吗?谢谢!