The boy______(stand)in th middile of the classroom______(hear)to sing just now.

问题描述:

The boy______(stand)in th middile of the classroom______(hear)to sing just now.

The boy (standing) in the middile of the classroom (was heard) to sing just now.
句意:站在教室中间的那个男孩就是刚才我们听到唱歌的那个.