题目

--- Do you know _____ Mr. Black’s address is.    --- He may live at No. 18 or No. 19 of Bridge Street. I'm not sure of _____. A. what; which      B. where; which    C. where ; what     D. what; where 答案：A两个互质的数最小公倍数是24，这两个数分别是（______ ）和（______ ）．