单项选择题

It was a long time ______ the neighbors found that the old lady bad been dead of cold.

[A] when
[B] until
[C] since
[D] before
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单项选择题
Prague offers visitors a series of excursions and leads them into a rich and ______ past.
[A] variable
[B] diverse
[C] different
[D] changeable
单项选择题
The young couple ______ with the Whites during their stay in New York City.
[A] put in
[B] put down
[C] put on
[D] put up
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