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【单选题】
The research is so designed that once _______ nothing can be done to change it．
A.
begins
B.
having begun
C.
beginning
D.
begun
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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A.
surprising
B.
shock
C.
affected
D.
moved
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A.
it
B.
that
C.
one
D.
this
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A.
especially
B.
formally
C.
definitely
D.
gradually
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A.
came across
B.
dealt with
C.
looked after
D.
went for
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A.
puzzling
B.
puzzle
C.
to puzzle
D.
puzzled
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A.
Left
B.
Being left
C.
Having left
D.
To leave
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A.
and
B.
but
C.
or
D.
so
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A.
where
B.
which
C.
how
D.
why
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A.
when
B.
how
C.
that
D.
whether
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A.
have killed
B.
had been killed
C.
were killed
D.
had killed