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【单选题】
—Jack, you water the flower today, ___? — But, dad, I watered it yesterday.A.
do you
B.
will you
C.
didn’t you
D.
don’t you
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举一反三
【单选题】Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century advances in techniques of genetic research.
A.
which
B.
whereas
C.
such as
D.
is also
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