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

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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
单项选择题
The hotel was awful!（）, our room was far too small. Then we found that the shower didn’t work.

A．To begin with
B．After all
C．In reality
D．As a whole
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