（2014年北京市西城区高三5月二模试题）25. The report aims to explain how these conclusions ______.
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A
were reached
B
had been reached
C
have reached
D
had reached
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The wireless video camera is ________to send its video signal to a nearby base station，allowing it to be viewed on a computer or a television．
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A
persuaded
B
pretended
C
intended
D
advised
Those postcards were so lovely that they_________ in no time.
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A
sold
B
had been sold
C
were sold
D
have been sold
Nelson Mandela__________ peacefully at his Johannesburg home on Thursday，President Jacob Zuma said.
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A
dies
B
died
C
has died
D
had died
I am disappointed because I ______________my favourite writer yet.
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A
didn’t see
B
haven’t seen
C
don’t see
D
have not been seeing
----- You seem in low spirits. Anything wrong?----- I ______ in the important exam. I let my parents down.
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A
fail
B
failed
C
has failed
D
had failed