―Do you know _____ Mr. Black’s address is?
―He may live at No. 18 or 19 Bridge Street. I’m not sure of ________.
A. what; which B. where; which
C. where; what D. what; where
―Do you know _____ Mr. Black’s address is?
―He may live at No. 18 or 19 Bridge Street. I’m not sure of ________.
A. what; which B. where; which
C. where; what D. what; where
A
What's one's address?是表示问某人地址的交际语，不可用when。which描指代十八或十九中的一个。