______ his car often _________ by someone? (to wash)

1)Is his car often washed
2)Does his car often wash
3)Are his car often washed
4)Do his car often washes

это не правильный ответ

Как раз-таки неверный, потому что здесь некорректно использовать are, указывающий на множественное число

1. Is his car often washed by someone

правильный ответ 3Are  his car often washed.