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【单选题】
The doctors are doing all that they _____, but the old man is still not breathing properly.
A.
shall
B.
need
C.
may
D.
can
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参考解析：
刷刷题刷刷变学霸
举一反三
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A.
to write
B.
writing
C.
is writing
D.
to be writing
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A.
together with
B.
like
C.
and not
D.
but in addition to
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A.
getting close to
B.
getting away from
C.
getting along with
D.
getting together with
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A.
keep; spreading
B.
prevent; spreading
C.
stop; to spread
D.
protect; to spread
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A.
that
B.
which
C.
where
D.
What
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A.
that
B.
when
C.
which
D.
where
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A.
which
B.
that
C.
one
D.
the one
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A.
It was
B.
There had
C.
There existed
D.
It had
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A.
so bad
B.
much better
C.
any worse
D.
the best