单项选择题

He（）have completed his work；otherwise, how 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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