某电压放大电路输入信号为<img src="https://static.zxtiku.com/wangke/imgs/topic/6cfb59c81b5e241b31e5c0e0401d4e70.jpg"/>，电压增益为-20dB，则输出信号可能是_____。<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/fce94dfcad128f58dfd8eab0ac042100.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/20d79e321633c365694301de0c4b64f8.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/c1e110922bb8497f6d9c3486d1f4c057.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/d95e35a72e33c5ce8752ac864aefcdad.jpg"/>