—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
网友回答
A. where
B. when
C. what
(答案→)D. why
解析：考查表语从句。句意：—我上个星期开车去珠海看航展。—那就是你请了几天假的原因吗？本句中的why you had a few days off是一个表语从句，why在句中做原因状语。故D正确。What要在句中做主语，表语或者宾语等成分。AB两项的语义与句意不相符。故D正确。