单项选择题

The little boy has by his sister.

A． been laughed at
B． laughed at
C． laughed
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单项选择题
You tell anybody about this — it's a secret.
A． can't
B． mustn't
C． needn't
单项选择题
My aunt arrived here ______ a warm spring morning.
A． in
B． at
C． on
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