20、(单选、2.5分)To succeed in a scientific experiment,__________A、one needs being patient personB、patience is to needC、one needs to be patientD、patience is what needed

______ leaves the office last should turn off the air conditioner.A) Who C) The personB) Whoever D) Anyone A: ______ leaves the office last should turn off the air conditioner. B: Who C: Whoever D: The person E: Anyone