The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
A．thatB．itC．thisD．him
B

這是考查it做形式賓語(yǔ)的用法，think it+adj/n+to do sth…,這里的不定式是真正的主語(yǔ)。句意是：主席認(rèn)為邀請(qǐng)Smith在會(huì)議上演講是必要的。
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