【题目】The chairman thought ________ necessary to invite Professor Smith to speak at the meeting.
A. thatB. itC. this D. him
在线课程【答案】B
【解析】
试题分析：考查it的用法。本句用it作形式宾语，代替 to invite Professor Smith to speak at the meeting，其他选项均不可以充当形式宾语。句意：主席认为邀请史密斯教授在会上讲话很有必要。故选B。