[单项选择]She had three daughters, all（）became nurses.
A. of which
B. of whom
C. which
D. who

Two or three times a week, she had a customer in (21) she began to take an interest. He was a middle-aged man (22) spectacles and a brown beard. He spoke English with a strong German accent. His clothes were worn and wrinkled, but he looked neat and had very good manners. He always bought two (23) of stale bread. He never asked for anything (24) stale bread; it cost a lot less than (25) bread. Once Miss Albert noticed a red and brown stain on his finger. She was sure that he was an artist and very poor. No doubt he lived in an attic, where he (26) pictures and ate stale bread and thought of good things to eat in the bakery.
Often when Miss Albert sat down to her evening meal, she (27) sigh and wish the artist might share her food instead of eating his dry bread. One day the customer came in (28) usual and asked for his stale bread. As the sudden noise of the fire engine made him hurry to the door, Miss Albert (29)
A. back
B. from
C. on
D. into