The old man _______ has been ill for monthsA.to operate on B.oper_英语解答

The old man _______ has been ill for months
A.to operate on B.operate on C.operated D.being operated on

人气：233 ℃　时间：2020-05-19 11:26:55

解答

D
那位正在被做手术的老人已经病了几个月了.
operate on sb.所以被动态的on不能省略.