—I hate talking with that guy. Look he is coming. What should I do? 　　—Don’t speak until

问题补充：

—I hate talking with that guy. Look, he is coming. What should I do?

—Don’t speak until.

A. speaking

B. spoken to

C. spoken

D. speaking to

答案：

A. speaking

(答案→)B. spoken to

C. spoken

D. speaking to

解析：状语从句的省略形式，其完整句子是Don’t speak until you are spoken to.