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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