27. We very early so we packed the night before.
(A) leave
(B) had left
(C) were leaving
(D)have left

考查动词时态。根据so后的并列句“我们前一天晚上就打好包了”，可知，“我们会很早离开”，故使用过去进行时表过去将来的动作。选C。