正确答案：A Listened 指听的动作
Hear 指结果,同时助动词后面要用动词原形
Do you think there is somebody in the room?
No,I _____ carefully,but didn`t _____ anything.
A.listened hear B.listened listen to
C.heard listen to D.heard hear
正确答案：A Listened 指听的动作
Hear 指结果,同时助动词后面要用动词原形