下面a小调的属七和弦省略三音的是哪个？<br/> <p> A. </p><br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/ff7b4a0f174818b48bdc5e323aae3348.jpg"/> <p> B. </p><br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/07b9c261b07173deba54fc2d86fbf382.jpg"/>