---Where’s the little elephant?

---It’s said it ___ in the hospital.

A．was examined

B．will be examined

C．is being examined

D．has been examined

根据R=

A．加在导体两端的电压越大，导体的电阻越大

B．导体中的电流强度越大，导体的电阻越小

C．导体的电阻跟电压成正比，跟电流强度成反比

D．导体的电阻与导体两侧的电压无关