I am especially glad that Bob decided to come to the party because we hadnt seen him _several month

来源：百度知道编辑：UC知道时间：2024/05/21 06:53:00

A. since
B. until
C. before
D. for

答案：D. since, until 后跟时间点。before 跟时间段应放后面。所以完成时后面的时间段要用for。

选D.译：我特别高兴鲍勃决定参加聚会，因为我们已经几个月没见到他了。several month是时间段。时间段前用for,用过去完成时。