单项选择题

A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

A. before
B. until
C. since
D. when
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单项选择题
After briefly ______ the history of the author, Prof. Li turtles to the novel itself immediately.
A. dipping in
B. dipping at
C. dipping into
D. dipping to
单项选择题
Features such as height, weight, and skin color ______ from individual to individual and from face to face.
A. vary
B. change
C. alter
D. convert
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