单项选择题

What did the speaker probably talk about previously

A．The lack of a qualified sales force.
B．A decline in the number of customers.
C．Difficulty in transporting merchandis
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A．Nine days.B．Two weeks.C．One mont
A．Nine days.
B．Two weeks.
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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.
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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