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【单选题】
左心室流入道是( )A.
动脉圆锥
B.
右心室
C.
左心室
D.
主动脉前庭
E.
腔静脉
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举一反三
【单选题】Since the accident has happened,don’t be sad.It’s no use over the spilt milk. [ ]
A.
cry
B.
to cry
C.
crying
D.
having cried
【单选题】The girl________ to milk since last winter.
A.
learns
B.
learned
C.
has learned
D.
would learn
【单选题】Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.
that; to eat
B.
whether; to be eaten
C.
whether; to eat
D.
that; to be eaten
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