单项选择题

Martha started her business because（）

A．someone asked her to.
B．she saw a good opportunity.
C．she had a lot of experience in fast foo

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单项选择题
22（）

A．to
B．at
C．in
D．on
单项选择题
One of the disadvantages of personal selling lies in its （）.

A．competition
B．flexibility
C．complexity
D．heavy cost
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