单选题：The chairman thought_________ necessary to invite Professor ..

题目内容：

The chairman thought_________ necessary to invite Professor Smith to speak at the meeting. [ ] A. that
B. it
C. this
D. him

参考答案：

— I feel ______ a pity that I didn't attend Professor Smith..

— I feel ______ a pity that I didn't attend Professor Smith's lecture.— You really should have.[ ]A. this B. it C. that D. one

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_______ time this afternoon, I would teach you how to use the computer.[ ]A. Had IB. Were I to haveC. If I had hadD. If I have

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His long speech made _____ difficult for the listeners to understand him.[ ]A. thatB. itC. oneD. this

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