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The chairman thought       necessary to invite Professor Smith to speak at the meeting.

A. that    B. it      C. this    D. him

The chairman thought_____necessary to invite Professor Smith to speak at the meeting.

A. that    B. it      C. this    D. him

The chairman thought ____ necessary to invite Professor Smith to speak at the meeting.

    A. that                         B. it

    C. this                         D. him

The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.

A. that                    B. it                     C. this            D. him

The chairman thought ______ necessary to invite Professor Smith to speak at the meeting.

A. that           B. it       C. this          D. him