单项选择题

He waited ______ the volcano became quiet and he was able to return two days later.

A. when
B. before
C. as
D. until
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The hero of the story is an artist in his ______.
A. thirtieth
B. thirty
C. thirty's
D. thirties
单项选择题
I ______ met him in Guilin in 1996.
A. the first
B. the firstly
C. first
D. first time
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