单项选择题

I’ll not ring you up ______ I come back.

A. when
B. as
C. until
D. while
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单项选择题
He looked at the train moving out of the station ______ it had disappeared.
A. when
B. until
C. after
D. since
单项选择题
______ the 1500’s ______ the first European explored the coast of California.
A. It was until ... then
B. It was not until ... when
C. it is until ... that

D. It was not until ... that
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