单项选择题

It was nine o'clock ______ I arrived at the airport.

A．that
B．before
C．when
D．since
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单项选择题
______ I wrote a little poem, I confidently placed it right on my father's plate on the dining room table.
A．The first time
B．At first
C．It was the first time
D．For the first time
单项选择题
______ there are only 20 minutes left before the train left, I felt uneasy in the taxi to the railway station.
A．That
B．When
C．Which
D．Because
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