问题描述：
.—Do you know ______Mr black’s address is
—He may live at No.18or No.19 of Bridge Street.I’m not sure of ______
A.where,which B.where ,what C.what,which D.what,where
—He may live at No.18or No.19 of Bridge Street.I’m not sure of ______
A.where,which B.where ,what C.what,which D.what,where
问题解答：
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