单项选择题

The president's visit to Japan had a positive effect () business () science and technology between the two countries.

A．on; as well as
B．to; as well
C．about; as well
D．in; as well as

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单项选择题
The workers are making radios, TV sets and some () things in this factory.

A．another
B．others
C．the others
D．other
单项选择题
The headmaster went to Washington () the first time last September.

A．for
B．on
C．at
D．in
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