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

試題分析：考查固定句型：think it+adj +to do，it是形式主語，不定式是真正的主語，句意：主席認為有必要邀請斯密斯博士來到會議上演講。選B。
點評：固定結構：think it+adj +to do，動詞還可以是make，feel，consider等。
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