题目内容：
阅读下列短文,回答题目.We walked so quietly that the nurse at the desk didn' t even lift her eyes from the book. Mumpointed to a big chair by the door and I knew she wanted me to have a seat. While ! watched,mouth open in surprise, mum took off her hat and coat and gave them to me to hold. She walkedquietly to the small room by the lift and took out a wet mop (拖把). She pushed the mop past thedesk and as the nurse looked up, mum nodded and said, "Very dirty floors. "
"Yes. I' m glad they've finally decided to clean them," the nurse said. She looked at mumstrangely and said, "But aren't you working late?"
Mum just pushed harder, each swipe(拖) of the mop taking her farther and farther down thehall. I watched until I couldn't see her and the nurse had turned back to write in the big book.
After a long time mum came back. Her eyes were shining. She rapidly put the mop back andtook my hand. As we turned to go out of the door, mum nodded politely to the nurse and said,"Thank you. "
Outside, mum told me, "Dagmar is fine. No fever. "
"You saw her, mum?"
"Of course. I told her about the hospital rules, and she will not expect us until tomorrow. Dadwill stop worrying as well. It' s a fine hospital. But such floors! A mop is no good. You need abrush. "
When she took a mop from the small room what mum really wanted to do was__________. A．lto clean the floor
B．to please the nurse
C．to see a patient
D．to surprise the storyteller
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