Something such as a question or letter that is ~ has not been answered.
Some of the most important questions remain ~...
He had always had difficulty leaving questions ~.
ADJ: v-link ADJ, ADJ n, ADJ after v
Something such as a question or letter that is ~ has not been answered.
Some of the most important questions remain ~...
He had always had difficulty leaving questions ~.
ADJ: v-link ADJ, ADJ n, ADJ after v
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012