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
______, the stronger the wind is.
A．The brighter the sun is
B．The harder it is raining
C．The faster the air is moving
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