单选题 Mr. Green was ill and went to the hospital. A doctor （ 21 ） and said, “Well, Mr. Green, you are going to （ 22 ） some injections (注射), and you’ll feel much better. A nurse will come （23） give you the first one this evening, and then you’ll （24） get another one tomorrow evening.” （ 25） a young nurse came to Mr. Green’s bed and said to him, “I am going to give you your （26） injection now, Mr. Green. Where do you want it?”
The old man was （27） . He looked at the nurse for a （ 28 ） , then he said, “ （ 29） has ever let me choose that before. Are you really going to let me choose now?”
“Yes, Mr. Green,” the nurse answered. She was in a hurry. “Where do you want it?”
“Well, then,” the old man answered （ 30 ） “I want it in your left arm, please.”