单项选择题

If set-top boxes with more features are manufactured,（）

A．they will be given away free.
B．users will have to pay for using them.
C．they will match with Echo Star’s products.

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单项选择题

A．when
B．if
C．whichever

单项选择题

A．to visit friends
B．to travel
C．to work.

If set-top boxes with more features are manufactured,（） 您的浏览器不支持 audio 元素。