单项选择题


A．ever
B．then
C．never
D．once
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单项选择题
They were _______ in their scientific research, not knowing what happened just outside their lab.
A．submerged
B．immersed
C．dipped
D．drowned
单项选择题
You should _______ to one or more weekly magazines such as Time, or Newsweek.
A．reclaim
B．order
C．subscribe
D．ascribe
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