单项选择题

Over the past decades, sea ice ______ in the Arctic as a result of global warming.

A.had decreased
B.decreased
C.has been decreasing
D.is decreasing
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单项选择题
It was the second time he ______ to me. I would never trust him again.
A.lied
B.has lied
C.was lying
D.had lied
单项选择题
The famous writer ______ one new book in the past two year.
A.is writing
B.was writing
C.wrote
D.has written
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