Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
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A
when
B
that
C
after
D
since
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It was along the Mississippi River _________ Mark Twain spent much of his childhood.
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A
how
B
which
C
that
D
where
It was not until last week_______ she found________ she thought was quite mistaken.
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A
when；that
B
that；that
C
when；what
D
that；what
Great changes have taken place since then in the primary school _______I am studying.
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A
where
B
that
C
which
D
there
lt was his positive attitude to life and hard work _________finally led him to his successful career .
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A
which
B
what
C
that
D
as