while Tony_____music,his father came home.A heardB hearingC listened toD was listening to

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while Tony_____music,his father came home.
A heard
B hearing
C listened to
D was listening to

D 这句话的意思是当Tony正在听音乐的时候 他爸回来了..
听音乐 listen to music 因此AB排除..
While应用进行时,所以选D...就算不知道这个,可以根据中文意思来判断选D