(2013·高考湖南卷)If nothing________，the oceans will turn into fish deserts.
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A
does
B
had been done
C
will do
D
is done
推荐题目
— Why do you look so worried? — My MacBook Pro broke down and my paper ______ unfinished since.
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A
has beenleft
B
hasleft
C
left
D
hadbeenleft
. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.
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A
were having
B
had had
C
were to have
D
had
The scientist __________ the experiment for half a year, but he _______ yet.
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A
made; didn’t succeed
B
made; hasn’t succeeded
C
was making; didn’t succeed
D
has been making; hasn’t succeeded
All of the guests by 9 o’clock , but the host until 15 minutes later .
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A
arrived ; didn’t turn up
B
had arrived ; didn’t turn up
C
arrived ; hadn’t turned up
D
had arrived; hadn’t turned up