1 feel that one of my main duties ______ a teacher is to help the students to become better learners.
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A
for
B
by
C
as
D
with
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It was at this shop ______ I came across one of my old friends.
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A
which
B
that
C
where
D
in which
I travel to the Binhai New Area by light railway every day, ________do many businessmen who live in downtown Tianjin.
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as
B
which
C
when
D
though
Life is like a long race ____ we compete with others to go beyond ourselves．
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A
which
B
what
C
that
D
where