The teacher tells his students to read the novel over and over again until they ______ it.
A. understand B. understood
C. have understood D. have been understood
The teacher tells his students to read the novel over and over again until they ______ it.
A. understand B. understood
C. have understood D. have been understood
A
until 引导的是状语从句，注意时态和前句的统一。