One of Marx’s works _____written in English in the 1860s.
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was
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were
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wouldbe
D
are
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These increased harvests _____ that 22% of the world’s people are fed from just 7% of the farmland in China.
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A
means
B
meant
C
mean
D
is meaning
Our school has about 100 computers, but only sixty percent ____ used regularly.
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is
B
are
C
was
D
were
The teacher，with 6 girls and 8 boys of her class，_____ visiting a museum when the earthquake struck.
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A
was
B
were
C
had been
D
would be