It was not until she failed in the exam ______she realized the importance of study.
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A
when
B
did
C
and
D
that
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It was not until all the fish died in the river_____the villagers realized the serious pollution.
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A
where
B
that
C
what
D
which
I just wonder ____________ that makes him so excited.
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A
why it does
B
what he does
C
how it is
D
what it is
It was 80 years before Christopher Columbus crossed the Atlantic Zheng He sailed to East Africa
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A
when
B
that
C
after
D
since