4. finished
句意为：我一干完手头上的事,就和家人一起去海边度假.为什么选择这个啊？我觉得是1啊I'd go to the seaside for a holiday with my family as soon as i _what i was doing.这句话，主句是过去将来时，从句也应该用相应的过去时态。在这里， as soon as i finishedwhat i was doing是用 一般过去时表示 将来时 的含义。（与 “主将从现”相似），而4.would finish放在这里翻译不通。