单项选择题

What did the speaker probably talk about previously

A．It allowed workers to spend more time at home.
B．It gave workers opportunity for better training.
C．It let workers live far from their jobs.
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A．Nine days.B．Two weeks.C．One mont
A．Nine days.
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A．The kinds of molecules in which carbon may be replaced by silicon.B．The importance of silicon.C．The difference between molecules and silicon.
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B．The importance of silicon.
C．The difference between molecules and silicon.
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