Question

After Mary ___ the room, she ___ the floor. * tidied up / washes tidies up / has washed has tidied up / washed had tidied up / washed is tidying up / washes ​

Answer 1

______had tidied up ,washed_____

Answer 2

After Mary tidied up the room, she washed the floor.

In this sentence, the action of tidying up the room happened first, followed by the action of washing the floor. Therefore, the correct verb tense to use for the first action is past simple - tidied up. The second action is also in the past simple tense - washed.