单项选择题

（）twice, the postman refused to deliver our letters unless we chained our dog.

A．Being bitten
B．Bitten
C．Having bitten
D．To be bitten

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单项选择题
Over the past decades, sea ice （） in the Arctic (北极) as a result of global warming.

A．had decreased
B．will decrease
C．has been decreasing
D．is decreasing
单项选择题
The company is starting a new advertising campaign to（）new customers to its stores.

A．join
B．attract
C．stick
D．transfer
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