Part 5（短文穴埋め） ／ タイプ: 時制難易度: ★★★★★
ゲスト: 本日の残り 10 / 10 問 ・ アカウント作成で進捗を保存
Before the replacement unit finally arrived, the engineers the source of the intermittent failure.
Before the replacement unit finally arrived, the engineers the source of the intermittent failure.