单项选择题


A．remain
B．increase
C．decrease
D．vary
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单项选择题
A．everB．thenC．neverD．once
A．ever
B．then
C．never
D．once
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
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