题目

―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 答案： 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。  

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