问题补充：
——Is there any possibilityyou could pick me up at the airport?
——No problem.
A. when
B. that
C. whether
D. what
答案：
A. when
(答案→)B. that
C. whether
D. what
解析：考查从句，从句you could pick me up at the airport不缺少成份，when表示时间；that只起引导作用，没有意义；whether引导宾语从句，是否；what表示什么人或物或事情
