By the time you get to the airport I for you at the gate.A. will have waitedB. will have

问题补充：

By the time you get to the airport, I for you at the gate.

A. will have waited

B. will have been waiting

C. will be waiting

D. am waiting

答案：

A. will have waited

B. will have been waiting

C. will be waiting

D. am waiting

解析：句意：到你到机场的时侯我会正在等你。By the time是连词短语，连接时间状语从句，因为时间状语从句是一般现在时，主句是将来范畴的时态，因为bythetime引导的状语从句，主句中往往使用完成时，但是如果遇见不带时间状语的表示状态的动词时，使用一般时，选C。