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
Giving a gift can convey a wealth of meaning about your appreciation of their()and the importance you place upon the relationship.

A. solidarity
B. priority
C. superiority
D. hospitality
单项选择题
If it()Professor Russel standing up for him, he would have had to leave.

A. hasn't been for
B. hadn't been for
C. was for
D. were for
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