频繁的技术问题阻碍了他按时完成项目。

The frequent technical issues ___frustrated his efforts to complete the project on time.

交通堵塞总是因为延误让我感到沮丧。

The traffic jam always ___frustrates me with delays.

交通堵塞彻底打乱了我们的行程安排。

The traffic jam completely ___frustrated our travel schedule.