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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单项选择题
A．College credit.B．Free theater tickets.C．A certificate of completion.
A．College credit.
B．Free theater tickets.
C．A certificate of completion.
单项选择题
A．Silicon is much more uncommon than carbon.B．Carbon is much more common than silicon.C．Silicon is much more common.
A．Silicon is much more uncommon than carbon.
B．Carbon is much more common than silicon.
C．Silicon is much more common.
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