单项选择题

I left a suitcase ______ the train the other day．

A． at
B． in
C． on
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单项选择题
There ______ water left in the bottle．
A． is a little
B． are a little
C． is a few
单项选择题
I'll go to Shanghai ______ a month's time．
A． at
B． in
C． after
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