Yesterday morning a prisoner escaped from the prison. It was a long time _____ the guards find out what had happened.
A. before
B. until
C. since
D. when
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The sound of the piano became fainter and fainter _____ it was not heard any longer.
A. since
B. after
C. until
D. as soon as
Not until the mother shouted at the top of her voice _____ his head.
A. that the boy turned
B. did the boy turn
C. the boy didn't turn
D. the boy had turned
Although he had not been in the field long, he had succeeded_____other researchers who had worked for years had failed.
A. which
B. that
C. what
D. where
The dietitian told the mother to prepare a meat-and-vegetable meal for the baby,____the baby is overweight.
A. on the condition of
B. because
C. for
D. when