who often cleans the blakboard every day?john()

题目

who often cleans the blakboard every day?john()
1,is cleaning2,is doing3,does 4,cleaned
选什么?为什么

答案

does
John often cleans the blackboard everyday.
提问用的是一般现在时,所以回答也要用一般现在时,第三人称单数