---- Where`s Mary now?Do you know?---- No,but I heard ____ in her room a few minutes ago.A.
问题描述：
---- Where`s Mary now?Do you know?---- No,but I heard ____ in her room a few minutes ago.A.
A.her singing B.her sing C.she was singing D.All the answers are right
答
答案错了,应该选A,hear sb doing sth(在某个时间段)