单项选择题

He is ______ spaceship and knows a lot about it.

A．interested about
B．interested in
C．interesting in
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单项选择题
He ______ playing football by his mother on the playground.
A．see
B．saw
C．was seen
单项选择题
China and India are ______ countries.
A．develop
B．developed
C．developing
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