The child _____ his mother carefully,but he couldn't ____ anything.A.listened,hearB.listened to,hearC.heard,listenD.heard,listen to
问题描述：
The child _____ his mother carefully,but he couldn't ____ anything.
A.listened,hear
B.listened to,hear
C.heard,listen
D.heard,listen to
答
B
listen to表示听的动作,hear表示听的结果.