单项选择题

He ______ have completed his work; otherwise, he wouldn"t be enjoying himself by the seaside.

A．should
B．must
C．wouldn"t
D．can"t
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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
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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