Read the short story and answer the following questions.
Between nine and ten on a dark September evening the only son of the district doctor, Kirilov, a child of six, called Andrey, died of diphtheria. Just as the doctor's wife sank on her knees by the dead child's bedside and was overwhelmed by the first rush of despair there came a sharp ring at the bell in the entry.
All the servants had been sent out of the house that morning on account of the diphtheria. Kirilov went to open the door. It was dark in the entry and nothing could be distinguished in the man who came in but medium height, a white scarf, and a large, extremely pale face, so pale that its entrance seemed to make the passage lighter.
"Is the doctor at home?" the newcomer asked quickly.
"I am at home," answered Kirilov. "What do you want?"
"Oh, it's you? I am very . . . very glad! We are acquainted. My name is Abogin, and I had the honour of meeting you in the summer at Gnutchev's. I am very glad I have found you at home. For God's sake don't refuse to come back with me at once. My wife has been taken dangerously ill. And the carriage is waiting."
Kirilov listened and said nothing, as though he did not understand Russian.
Q. Which of the following is a near synonym of the word ‘acquainted’?