(2013·重庆，35)—Forgotten something？I can keep an eye on your kids if you want to go and get it.

—________.Thank you all the same.

A．It's very kind of you.

B．Oh，how careless of me!

C．I might as well go and get it.

D．Well，I can do without it.

画放大电路的交流通道时，电容可看作开路，直流电源可视为短路。