单项选择题

The Johnsons have been on holiday ________ the end of June.

A． since
B． for
C． at
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单项选择题
When I got to the railway station, the train _______ .
A． left
B． had left
C． has left
单项选择题
I usually buy ________ newspaper on my way to work.
A． an
B． a
C． the
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