___i was getting ready for a picnic,she was listening to music.A when B if C while D because

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___i was getting ready for a picnic,she was listening to music.A when B if C while D because

___i was getting ready for a picnic,she was listening to music.A when B if C while D because
___i was getting ready for a picnic,she was listening to music.A when B if C while D because

___i was getting ready for a picnic,she was listening to music.A when B if C while D because
C while 当.时候 后跟从句 必须是持续的动作如过去进行时态

选C。
当我正为野餐做准备时,她正在听音乐。