单项选择题

This is the ______ piano on which the composer created some of his greatest works.

A．true
B．original
C．real
D．genuine

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单项选择题
Not only ______ people to send words, music, and codes to any pan of the world, it can also be used to communicate far into space.
A．enabled by radio
B．radio enables
C．does radio enable
D．has radio enabled
单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
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