请问hear sb doing sth这里sb是主格还是宾格?还有一题-Where is Mary now?-I hea
请问hear sb doing sth这里sb是主格还是宾格?还有一题-Where is Mary now?-I heard__in her room just now A her singing B her sing C she was singing D All the answers are right请问该选什么? I heard__in her room just now刚才没打全