—I drove to Zhuhai for the air show last week.—Is that you had a few days off ?A. whereB.

问题补充：

—I drove to Zhuhai for the air show last week.

—Is that you had a few days off ?

A. where

B. when

C. what

D. why

答案：

A. where

B. when

C. what

(答案→)D. why

解析：句意：--上周我开车去珠海看航展了。--那就是你请几天假的原因吗？that是句子的主语，这是表语从句，从句中不缺少主语和宾语故排除C。根据句意故选D。