(2013·河南豫西五校高三质检)Helen has just heard the news from her father ________ her boyfriend David will come back soon.
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A
when
B
how
C
which
D
that
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Only if enough evidence is discovered _______ in the existence of the monster.
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A
will people believe
B
people will believe
C
shall people believe
D
people shall believe
Not a single mistake _______ in the last test.
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A
she made
B
made she
C
did she make
D
she did make
He said that not until the wheat died from the lack of water_____ how serious the drought was.
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A
did the villagers realize
B
the villagers realized
C
the villagers did realize
D
realized the villagers
(2013·福建，34)Not until he went through real hardship ________ the love we have for our families is important.
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A
had he realized
B
did he realize
C
he realized
D
he had realized
Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
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A
having left
B
to leave
C
left
D
leaving