单项选择题

It is reported that the police will soon look（）the case of the two missing children.

A．upon
B．after
C．into
D．out

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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
（） 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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