Контрольные задания

Вопрос:

Фото задания: 50. Learning the piano isn’t as difficult ___ learning the violin. A like B so C than D as

Фото задания

50. Learning the piano isn’t as difficult ___ learning the violin. A like B so C than D as

В конструкции not as ... as используется союз as.

Ответ: D: as.