Final answer:
The word 'Dr.' needs to be capitalized in the sentence as it precedes Tanya Miller's name and serves as her title.
Step-by-step explanation:
The word that needs to be capitalized in the sentence "Last week, dr. Tanya Miller received a special award from the city of Atlanta." is "Dr.". According to standard English grammar rules, titles that precede a person’s name should be capitalized, such as Dr., Senator, Mr., etc. However, if the title comes after the person’s name or is used in a general sense, the title is not capitalized. The correct version of the sentence would therefore be "Last week, Dr. Tanya Miller received a special award from the city of Atlanta."