---Could I use your cellphone to make a call?

问题描述:

---Could I use your cellphone to make a call?
---Sorry.it____in the office.
A is charging
B has charged
C is being charged
D has been charged
charge 及物吗?

选C.
这里是现在进行时的被动语态
意为:不好意思,手机正在办公室(被)充电.