单项选择题

There ______ some boys on the playground.

A．is
B．are
C．have
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单项选择题
Mr. Black returned to London_________.
A．by train
B．by ship
C．by plane
单项选择题
Mr. Black said the local bird was an interpreter because_________.
A．the three Chinese birds didn't know English
B．it was different from the Chinese birds
C．he was making a joke
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